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<?php
if ( ! defined( 'ABSPATH' ) ) {
	exit;
}

// phpcs:disable WordPress.Security.EscapeOutput -- Third-party Simple HTML DOM Parser library.

/**
 * Website: http://sourceforge.net/projects/simplehtmldom/
 * Additional projects: http://sourceforge.net/projects/debugobject/
 * Acknowledge: Jose Solorzano (https://sourceforge.net/projects/php-html/)
 *
 * Licensed under The MIT License
 * See the LICENSE file in the project root for more information.
 *
 * Authors:
 *   S.C. Chen
 *   John Schlick
 *   Rus Carroll
 *   logmanoriginal
 *
 * Contributors:
 *   Yousuke Kumakura
 *   Vadim Voituk
 *   Antcs
 *
 * Version Rev. 1.9.1 (291)
 */

define( 'HDOM_TYPE_ELEMENT', 1 );
define( 'HDOM_TYPE_COMMENT', 2 );
define( 'HDOM_TYPE_TEXT', 3 );
define( 'HDOM_TYPE_ENDTAG', 4 );
define( 'HDOM_TYPE_ROOT', 5 );
define( 'HDOM_TYPE_UNKNOWN', 6 );
define( 'HDOM_QUOTE_DOUBLE', 0 );
define( 'HDOM_QUOTE_SINGLE', 1 );
define( 'HDOM_QUOTE_NO', 3 );
define( 'HDOM_INFO_BEGIN', 0 );
define( 'HDOM_INFO_END', 1 );
define( 'HDOM_INFO_QUOTE', 2 );
define( 'HDOM_INFO_SPACE', 3 );
define( 'HDOM_INFO_TEXT', 4 );
define( 'HDOM_INFO_INNER', 5 );
define( 'HDOM_INFO_OUTER', 6 );
define( 'HDOM_INFO_ENDSPACE', 7 );

defined( 'SEEDPROD_DEFAULT_TARGET_CHARSET' ) || define( 'SEEDPROD_DEFAULT_TARGET_CHARSET', 'UTF-8' );
defined( 'SEEDPROD_DEFAULT_BR_TEXT' ) || define( 'SEEDPROD_DEFAULT_BR_TEXT', "\r\n" );
defined( 'SEEDPROD_DEFAULT_SPAN_TEXT' ) || define( 'SEEDPROD_DEFAULT_SPAN_TEXT', ' ' );
defined( 'SEEDPROD_MAX_FILE_SIZE' ) || define( 'SEEDPROD_MAX_FILE_SIZE', 600000 );
define( 'HDOM_SMARTY_AS_TEXT', 1 );

function seedprod_file_get_html(
	$url,
	$use_include_path = false,
	$context = null,
	$offset = 0,
	$maxLen = -1,
	$lowercase = true,
	$forceTagsClosed = true,
	$target_charset = SEEDPROD_DEFAULT_TARGET_CHARSET,
	$stripRN = true,
	$defaultBRText = SEEDPROD_DEFAULT_BR_TEXT,
	$defaultSpanText = SEEDPROD_DEFAULT_SPAN_TEXT
) {
	if ( $maxLen <= 0 ) {
		$maxLen = SEEDPROD_MAX_FILE_SIZE; }

$dom = new seedprod_simple_html_dom(
		null,
		$lowercase,
		$forceTagsClosed,
		$target_charset,
		$stripRN,
		$defaultBRText,
		$defaultSpanText
	);

/**
	 * For sourceforge users: uncomment the next line and comment the
	 * retrieve_url_contents line 2 lines down if it is not already done.
	 */
	$contents = file_get_contents(
		$url,
		$use_include_path,
		$context,
		$offset,
		$maxLen
	);
	// $contents = retrieve_url_contents($url);

if ( empty( $contents ) || strlen( $contents ) > $maxLen ) {
		$dom->clear();
		return false;
	}

return $dom->load( $contents, $lowercase, $stripRN );
}

function seedprod_str_get_html(
	$str,
	$lowercase = true,
	$forceTagsClosed = true,
	$target_charset = SEEDPROD_DEFAULT_TARGET_CHARSET,
	$stripRN = true,
	$defaultBRText = SEEDPROD_DEFAULT_BR_TEXT,
	$defaultSpanText = SEEDPROD_DEFAULT_SPAN_TEXT
) {
	$dom = new seedprod_simple_html_dom(
		null,
		$lowercase,
		$forceTagsClosed,
		$target_charset,
		$stripRN,
		$defaultBRText,
		$defaultSpanText
	);

if ( empty( $str ) || strlen( $str ) > SEEDPROD_MAX_FILE_SIZE ) {
		$dom->clear();
		return false;
	}

return $dom->load( $str, $lowercase, $stripRN );
}

function seedprod_dump_html_tree( $node, $show_attr = true, $deep = 0 ) {
	$node->dump( $node );
}

class seedprod_seedprod_simple_html_dom_node {

public $nodetype  = HDOM_TYPE_TEXT;
	public $tag       = 'text';
	public $attr      = array();
	public $children  = array();
	public $nodes     = array();
	public $parent    = null;
	public $_         = array();
	public $tag_start = 0;
	private $dom      = null;

function __construct( $dom ) {
		$this->dom    = $dom;
		$dom->nodes[] = $this;
	}

function __destruct() {
		$this->clear();
	}

function __toString() {
		return $this->outertext();
	}

function clear() {
		$this->dom      = null;
		$this->nodes    = null;
		$this->parent   = null;
		$this->children = null;
	}

function dump( $show_attr = true, $depth = 0 ) {
		echo str_repeat( "\t", $depth ) . $this->tag;

if ( $show_attr && count( $this->attr ) > 0 ) {
			echo '(';
			foreach ( $this->attr as $k => $v ) {
				echo "[$k]=>\"$v\", ";
			}
			echo ')';
		}

echo "\n";

if ( $this->nodes ) {
			foreach ( $this->nodes as $node ) {
				$node->dump( $show_attr, $depth + 1 );
			}
		}
	}

function dump_node( $echo = true ) {
		$string = $this->tag;

if ( count( $this->attr ) > 0 ) {
			$string .= '(';
			foreach ( $this->attr as $k => $v ) {
				$string .= "[$k]=>\"$v\", ";
			}
			$string .= ')';
		}

if ( count( $this->_ ) > 0 ) {
			$string .= ' $_ (';
			foreach ( $this->_ as $k => $v ) {
				if ( is_array( $v ) ) {
					$string .= "[$k]=>(";
					foreach ( $v as $k2 => $v2 ) {
						$string .= "[$k2]=>\"$v2\", ";
					}
					$string .= ')';
				} else {
					$string .= "[$k]=>\"$v\", ";
				}
			}
			$string .= ')';
		}

if ( isset( $this->text ) ) {
			$string .= " text: ({$this->text})";
		}

$string .= ' HDOM_INNER_INFO: ';

if ( isset( $node->_[ HDOM_INFO_INNER ] ) ) {
			$string .= "'" . $node->_[ HDOM_INFO_INNER ] . "'";
		} else {
			$string .= ' NULL ';
		}

$string .= ' children: ' . count( $this->children );
		$string .= ' nodes: ' . count( $this->nodes );
		$string .= ' tag_start: ' . $this->tag_start;
		$string .= "\n";

if ( $echo ) {
			echo $string;
			return;
		} else {
			return $string;
		}
	}

function parent( $parent = null ) {
		// I am SURE that this doesn't work properly.
		// It fails to unset the current node from it's current parents nodes or.
		// children list first.
		if ( $parent !== null ) {
			$this->parent             = $parent;
			$this->parent->nodes[]    = $this;
			$this->parent->children[] = $this;
		}

return $this->parent;
	}

function has_child() {
		return ! empty( $this->children );
	}

function children( $idx = -1 ) {
		if ( $idx === -1 ) {
			return $this->children;
		}

if ( isset( $this->children[ $idx ] ) ) {
			return $this->children[ $idx ];
		}

return null;
	}

function first_child() {
		if ( count( $this->children ) > 0 ) {
			return $this->children[0];
		}
		return null;
	}

function last_child() {
		if ( count( $this->children ) > 0 ) {
			return end( $this->children );
		}
		return null;
	}

function next_sibling() {
		if ( $this->parent === null ) {
			return null;
		}

$idx = array_search( $this, $this->parent->children, true );

if ( $idx !== false && isset( $this->parent->children[ $idx + 1 ] ) ) {
			return $this->parent->children[ $idx + 1 ];
		}

return null;
	}

function prev_sibling() {
		if ( $this->parent === null ) {
			return null;
		}

$idx = array_search( $this, $this->parent->children, true );

if ( $idx !== false && $idx > 0 ) {
			return $this->parent->children[ $idx - 1 ];
		}

return null;
	}

function find_ancestor_tag( $tag ) {
		global $debug_object;
		if ( is_object( $debug_object ) ) {
			$debug_object->debug_log_entry( 1 ); }

if ( $this->parent === null ) {
			return null;
		}

$ancestor = $this->parent;

while ( ! is_null( $ancestor ) ) {
			if ( is_object( $debug_object ) ) {
				$debug_object->debug_log( 2, 'Current tag is: ' . $ancestor->tag );
			}

if ( $ancestor->tag === $tag ) {
				break;
			}

$ancestor = $ancestor->parent;
		}

return $ancestor;
	}

function innertext() {
		if ( isset( $this->_[ HDOM_INFO_INNER ] ) ) {
			return $this->_[ HDOM_INFO_INNER ];
		}

if ( isset( $this->_[ HDOM_INFO_TEXT ] ) ) {
			return $this->dom->restore_noise( $this->_[ HDOM_INFO_TEXT ] );
		}

$ret = '';

foreach ( $this->nodes as $n ) {
			$ret .= $n->outertext();
		}

return $ret;
	}

function outertext() {
		global $debug_object;

if ( is_object( $debug_object ) ) {
			$text = '';

if ( $this->tag === 'text' ) {
				if ( ! empty( $this->text ) ) {
					$text = ' with text: ' . $this->text;
				}
			}

$debug_object->debug_log( 1, 'Innertext of tag: ' . $this->tag . $text );
		}

if ( $this->tag === 'root' ) {
			return $this->innertext();
		}

// todo: What is the use of this callback? Remove?
		if ( $this->dom && $this->dom->callback !== null ) {
			call_user_func_array( $this->dom->callback, array( $this ) );
		}

if ( isset( $this->_[ HDOM_INFO_OUTER ] ) ) {
			return $this->_[ HDOM_INFO_OUTER ];
		}

if ( isset( $this->_[ HDOM_INFO_TEXT ] ) ) {
			return $this->dom->restore_noise( $this->_[ HDOM_INFO_TEXT ] );
		}

$ret = '';

if ( $this->dom && $this->dom->nodes[ $this->_[ HDOM_INFO_BEGIN ] ] ) {
			$ret = $this->dom->nodes[ $this->_[ HDOM_INFO_BEGIN ] ]->makeup();
		}

if ( isset( $this->_[ HDOM_INFO_INNER ] ) ) {
			// todo: <br> should either never have HDOM_INFO_INNER or always.
			if ( $this->tag !== 'br' ) {
				$ret .= $this->_[ HDOM_INFO_INNER ];
			}
		} elseif ( $this->nodes ) {
			foreach ( $this->nodes as $n ) {
				$ret .= $this->convert_text( $n->outertext() );
			}
		}

if ( isset( $this->_[ HDOM_INFO_END ] ) && $this->_[ HDOM_INFO_END ] != 0 ) {
			$ret .= '</' . $this->tag . '>';
		}

return $ret;
	}

function text() {
		if ( isset( $this->_[ HDOM_INFO_INNER ] ) ) {
			return $this->_[ HDOM_INFO_INNER ];
		}

switch ( $this->nodetype ) {
			case HDOM_TYPE_TEXT:
				return $this->dom->restore_noise( $this->_[ HDOM_INFO_TEXT ] );
			case HDOM_TYPE_COMMENT:
				return '';
			case HDOM_TYPE_UNKNOWN:
				return '';
		}

if ( strcasecmp( $this->tag, 'script' ) === 0 ) {
			return ''; }
		if ( strcasecmp( $this->tag, 'style' ) === 0 ) {
			return ''; }

$ret = '';

// In rare cases, (always node type 1 or HDOM_TYPE_ELEMENT - observed
		// for some span tags, and some p tags) $this->nodes is set to NULL.
		// NOTE: This indicates that there is a problem where it's set to NULL.
		// without a clear happening.
		// WHY is this happening?
		if ( ! is_null( $this->nodes ) ) {
			foreach ( $this->nodes as $n ) {
				// Start paragraph after a blank line.
				if ( $n->tag === 'p' ) {
					$ret = trim( $ret ) . "\n\n";
				}

$ret .= $this->convert_text( $n->text() );

// If this node is a span... add a space at the end of it so.
				// multiple spans don't run into each other.  This is plaintext.
				// after all.
				if ( $n->tag === 'span' ) {
					$ret .= $this->dom->default_span_text;
				}
			}
		}
		return $ret;
	}

function xmltext() {
		$ret = $this->innertext();
		$ret = str_ireplace( '<![CDATA[', '', $ret );
		$ret = str_replace( ']]>', '', $ret );
		return $ret;
	}

function makeup() {
		// text, comment, unknown.
		if ( isset( $this->_[ HDOM_INFO_TEXT ] ) ) {
			return $this->dom->restore_noise( $this->_[ HDOM_INFO_TEXT ] );
		}

$ret = '<' . $this->tag;
		$i   = -1;

foreach ( $this->attr as $key => $val ) {
			++$i;

// skip removed attribute.
			if ( $val === null || $val === false ) {
				continue; }

$ret .= $this->_[ HDOM_INFO_SPACE ][ $i ][0];

// no value attr: nowrap, checked selected...
			if ( $val === true ) {
				$ret .= $key;
			} else {
				switch ( $this->_[ HDOM_INFO_QUOTE ][ $i ] ) {
					case HDOM_QUOTE_DOUBLE:
						$quote = '"';
						break;
					case HDOM_QUOTE_SINGLE:
						$quote = '\'';
						break;
					default:
						$quote = '';
				}

$ret .= $key
				. $this->_[ HDOM_INFO_SPACE ][ $i ][1]
				. '='
				. $this->_[ HDOM_INFO_SPACE ][ $i ][2]
				. $quote
				. $val
				. $quote;
			}
		}

$ret = $this->dom->restore_noise( $ret );
		return $ret . $this->_[ HDOM_INFO_ENDSPACE ] . '>';
	}

function find( $selector, $idx = null, $lowercase = false ) {
		$selectors = $this->parse_selector( $selector );
		if ( ( $count = count( $selectors ) ) === 0 ) {
			return array(); }
		$found_keys = array();

// find each selector.
		for ( $c = 0; $c < $count; ++$c ) {
			// The change on the below line was documented on the sourceforge.
			// code tracker id 2788009.
			// used to be: if (($levle=count($selectors[0]))===0) return array();
			if ( ( $levle = count( $selectors[ $c ] ) ) === 0 ) {
				return array(); }
			if ( ! isset( $this->_[ HDOM_INFO_BEGIN ] ) ) {
				return array(); }

$head = array( $this->_[ HDOM_INFO_BEGIN ] => 1 );
			$cmd  = ' '; // Combinator

// handle descendant selectors, no recursive!
			for ( $l = 0; $l < $levle; ++$l ) {
				$ret = array();

foreach ( $head as $k => $v ) {
					$n = ( $k === -1 ) ? $this->dom->root : $this->dom->nodes[ $k ];
					// PaperG - Pass this optional parameter on to the seek function.
					$n->seek( $selectors[ $c ][ $l ], $ret, $cmd, $lowercase );
				}

$head = $ret;
				$cmd  = $selectors[ $c ][ $l ][4]; // Next Combinator
			}

foreach ( $head as $k => $v ) {
				if ( ! isset( $found_keys[ $k ] ) ) {
					$found_keys[ $k ] = 1;
				}
			}
		}

// sort keys.
		ksort( $found_keys );

$found = array();
		foreach ( $found_keys as $k => $v ) {
			$found[] = $this->dom->nodes[ $k ];
		}

// return nth-element or array.
		if ( is_null( $idx ) ) {
			return $found; } elseif ( $idx < 0 ) {
			$idx = count( $found ) + $idx; }
			return ( isset( $found[ $idx ] ) ) ? $found[ $idx ] : null;
	}

protected function seek( $selector, &$ret, $parent_cmd, $lowercase = false ) {
		global $debug_object;
		if ( is_object( $debug_object ) ) {
			$debug_object->debug_log_entry( 1 ); }

list($tag, $id, $class, $attributes, $cmb) = $selector;
		$nodes                                     = array();

if ( $parent_cmd === ' ' ) { // Descendant Combinator
			// Find parent closing tag if the current element doesn't have a closing.
			// tag (i.e. void element)
			$end = ( ! empty( $this->_[ HDOM_INFO_END ] ) ) ? $this->_[ HDOM_INFO_END ] : 0;
			if ( $end == 0 ) {
				$parent = $this->parent;
				while ( ! isset( $parent->_[ HDOM_INFO_END ] ) && $parent !== null ) {
					$end   -= 1;
					$parent = $parent->parent;
				}
				$end += $parent->_[ HDOM_INFO_END ];
			}

// Get list of target nodes.
			$nodes_start = $this->_[ HDOM_INFO_BEGIN ] + 1;
			$nodes_count = $end - $nodes_start;
			$nodes       = array_slice( $this->dom->nodes, $nodes_start, $nodes_count, true );
		} elseif ( $parent_cmd === '>' ) { // Child Combinator
			$nodes = $this->children;
		} elseif ( $parent_cmd === '+'
			&& $this->parent
			&& in_array( $this, $this->parent->children ) ) { // Next-Sibling Combinator
				$index = array_search( $this, $this->parent->children, true ) + 1;
			if ( $index < count( $this->parent->children ) ) {
				$nodes[] = $this->parent->children[ $index ];
			}
		} elseif ( $parent_cmd === '~'
			&& $this->parent
			&& in_array( $this, $this->parent->children ) ) { // Subsequent Sibling Combinator
				$index = array_search( $this, $this->parent->children, true );
				$nodes = array_slice( $this->parent->children, $index );
		}

// Go throgh each element starting at this element until the end tag.
		// Note: If this element is a void tag, any previous void element is.
		// skipped.
		foreach ( $nodes as $node ) {
			$pass = true;

// Skip root nodes.
			if ( ! $node->parent ) {
				$pass = false;
			}

// Handle 'text' selector.
			if ( $pass && $tag === 'text' && $node->tag === 'text' ) {
				$ret[ array_search( $node, $this->dom->nodes, true ) ] = 1;
				unset( $node );
				continue;
			}

// Skip if node isn't a child node (i.e. text nodes)
			if ( $pass && ! in_array( $node, $node->parent->children, true ) ) {
				$pass = false;
			}

// Skip if tag doesn't match.
			if ( $pass && $tag !== '' && $tag !== $node->tag && $tag !== '*' ) {
				$pass = false;
			}

// Skip if ID doesn't exist.
			if ( $pass && $id !== '' && ! isset( $node->attr['id'] ) ) {
				$pass = false;
			}

// Check if ID matches.
			if ( $pass && $id !== '' && isset( $node->attr['id'] ) ) {
				// Note: Only consider the first ID (as browsers do)
				$node_id = explode( ' ', trim( $node->attr['id'] ) )[0];

if ( $id !== $node_id ) {
					$pass = false; }
			}

// Check if all class(es) exist
			if ( $pass && $class !== '' && is_array( $class ) && ! empty( $class ) ) {
				if ( isset( $node->attr['class'] ) ) {
					$node_classes = explode( ' ', $node->attr['class'] );

if ( $lowercase ) {
						$node_classes = array_map( 'strtolower', $node_classes );
					}

foreach ( $class as $c ) {
						if ( ! in_array( $c, $node_classes ) ) {
							$pass = false;
							break;
						}
					}
				} else {
					$pass = false;
				}
			}

// Check attributes.
			if ( $pass
				&& $attributes !== ''
				&& is_array( $attributes )
				&& ! empty( $attributes ) ) {
				foreach ( $attributes as $a ) {
					list (
						$att_name,
						$att_expr,
						$att_val,
						$att_inv,
						$att_case_sensitivity
					) = $a;

// Handle indexing attributes (i.e. "[2]")
					/**
					 * Note: This is not supported by the CSS Standard but adds
					 * the ability to select items compatible to XPath (i.e.
					 * the 3rd element within it's parent).
					 *
					 * Note: This doesn't conflict with the CSS Standard which
					 * doesn't work on numeric attributes anyway.
					 */
					if ( is_numeric( $att_name )
						&& $att_expr === ''
						&& $att_val === '' ) {
							$count = 0;

// Find index of current element in parent.
						foreach ( $node->parent->children as $c ) {
							if ( $c->tag === $node->tag ) {
								++$count;
							}
							if ( $c === $node ) {
								break;
							}
						}

// If this is the correct node, continue with next.
							// attribute.
						if ( $count === (int) $att_name ) {
							continue;
						}
					}

// Check attribute availability.
					if ( $att_inv ) { // Attribute should NOT be set
						if ( isset( $node->attr[ $att_name ] ) ) {
							$pass = false;
							break;
						}
					} else { // Attribute should be set
						// todo: "plaintext" is not a valid CSS selector!
						if ( $att_name !== 'plaintext'
							&& ! isset( $node->attr[ $att_name ] ) ) {
								$pass = false;
								break;
						}
					}

// Continue with next attribute if expression isn't defined.
					if ( $att_expr === '' ) {
						continue;
					}

// If they have told us that this is a "plaintext".
					// search then we want the plaintext of the node - right?
					// todo "plaintext" is not a valid CSS selector!
					if ( $att_name === 'plaintext' ) {
						$nodeKeyValue = $node->text();
					} else {
						$nodeKeyValue = $node->attr[ $att_name ];
					}

if ( is_object( $debug_object ) ) {
						$debug_object->debug_log(
							2,
							'testing node: '
							. $node->tag
							. ' for attribute: '
							. $att_name
							. $att_expr
							. $att_val
							. ' where nodes value is: '
							. $nodeKeyValue
						);
					}

// If lowercase is set, do a case insensitive test of.
					// the value of the selector.
					if ( $lowercase ) {
						$check = $this->match(
							$att_expr,
							strtolower( $att_val ),
							strtolower( $nodeKeyValue ),
							$att_case_sensitivity
						);
					} else {
						$check = $this->match(
							$att_expr,
							$att_val,
							$nodeKeyValue,
							$att_case_sensitivity
						);
					}

if ( is_object( $debug_object ) ) {
						$debug_object->debug_log(
							2,
							'after match: '
							. ( $check ? 'true' : 'false' )
						);
					}

if ( ! $check ) {
						$pass = false;
						break;
					}
				}
			}

// Found a match. Add to list and clear node.
			if ( $pass ) {
				$ret[ $node->_[ HDOM_INFO_BEGIN ] ] = 1;
			}
			unset( $node );
		}
		// It's passed by reference so this is actually what this function returns.
		if ( is_object( $debug_object ) ) {
			$debug_object->debug_log( 1, 'EXIT - ret: ', $ret );
		}
	}

protected function match( $exp, $pattern, $value, $case_sensitivity ) {
		global $debug_object;
		if ( is_object( $debug_object ) ) {
			$debug_object->debug_log_entry( 1 );}

if ( $case_sensitivity === 'i' ) {
			$pattern = strtolower( $pattern );
			$value   = strtolower( $value );
		}

switch ( $exp ) {
			case '=':
				return ( $value === $pattern );
			case '!=':
				return ( $value !== $pattern );
			case '^=':
				return preg_match( '/^' . preg_quote( $pattern, '/' ) . '/', $value );
			case '$=':
				return preg_match( '/' . preg_quote( $pattern, '/' ) . '$/', $value );
			case '*=':
				return preg_match( '/' . preg_quote( $pattern, '/' ) . '/', $value );
			case '|=':
				/**
				 * [att|=val]
				 *
				 * Represents an element with the att attribute, its value
				 * either being exactly "val" or beginning with "val"
				 * immediately followed by "-" (U+002D).
				 */
				return strpos( $value, $pattern ) === 0;
			case '~=':
				/**
				 * [att~=val]
				 *
				 * Represents an element with the att attribute whose value is a
				 * whitespace-separated list of words, one of which is exactly
				 * "val". If "val" contains whitespace, it will never represent
				 * anything (since the words are separated by spaces). Also if
				 * "val" is the empty string, it will never represent anything.
				 */
				return in_array( $pattern, explode( ' ', trim( $value ) ), true );
		}
		return false;
	}

protected function parse_selector( $selector_string ) {
		global $debug_object;
		if ( is_object( $debug_object ) ) {
			$debug_object->debug_log_entry( 1 ); }

/**
		 * Pattern of CSS selectors, modified from mootools (https://mootools.net/)
		 *
		 * Paperg: Add the colon to the attribute, so that it properly finds
		 * <tag attr:ibute="something" > like google does.
		 *
		 * Note: if you try to look at this attribute, you MUST use getAttribute
		 * since $dom->x:y will fail the php syntax check.
		 *
		 * Notice the \[ starting the attribute? and the @? following? This
		 * implies that an attribute can begin with an @ sign that is not
		 * captured. This implies that an html attribute specifier may start
		 * with an @ sign that is NOT captured by the expression. Farther study
		 * is required to determine of this should be documented or removed.
		 *
		 * Matches selectors in this order:
		 *
		 * [0] - full match
		 *
		 * [1] - tag name
		 *     ([\w:\*-]*)
		 *     Matches the tag name consisting of zero or more words, colons,
		 *     asterisks and hyphens.
		 *
		 * [2] - id name
		 *     (?:\#([\w-]+))
		 *     Optionally matches a id name, consisting of an "#" followed by
		 *     the id name (one or more words and hyphens).
		 *
		 * [3] - class names (including dots)
		 *     (?:\.([\w\.-]+))?
		 *     Optionally matches a list of classs, consisting of an "."
		 *     followed by the class name (one or more words and hyphens)
		 *     where multiple classes can be chained (i.e. ".foo.bar.baz")
		 *
		 * [4] - attributes
		 *     ((?:\[@?(?:!?[\w:-]+)(?:(?:[!*^$|~]?=)[\"']?(?:.*?)[\"']?)?(?:\s*?(?:[iIsS])?)?\])+)?
		 *     Optionally matches the attributes list
		 *
		 * [5] - separator
		 *     ([\/, >+~]+)
		 *     Matches the selector list separator
		 */
		// phpcs:ignore Generic.Files.LineLength
		$pattern = "/([\w:\*-]*)(?:\#([\w-]+))?(?:|\.([\w\.-]+))?((?:\[@?(?:!?[\w:-]+)(?:(?:[!*^$|~]?=)[\"']?(?:.*?)[\"']?)?(?:\s*?(?:[iIsS])?)?\])+)?([\/, >+~]+)/is";

preg_match_all(
			$pattern,
			trim( $selector_string ) . ' ', // Add final ' ' as pseudo separator
			$matches,
			PREG_SET_ORDER
		);

if ( is_object( $debug_object ) ) {
			$debug_object->debug_log( 2, 'Matches Array: ', $matches );
		}

$selectors = array();
		$result    = array();

foreach ( $matches as $m ) {
			$m[0] = trim( $m[0] );

// Skip NoOps.
			if ( $m[0] === '' || $m[0] === '/' || $m[0] === '//' ) {
				continue; }

// Convert to lowercase.
			if ( $this->dom->lowercase ) {
				$m[1] = strtolower( $m[1] );
			}

// Extract classes.
			if ( $m[3] !== '' ) {
				$m[3] = explode( '.', $m[3] ); }

/*
			Extract attributes (pattern based on the pattern above!)

* [0] - full match
			 * [1] - attribute name
			 * [2] - attribute expression
			 * [3] - attribute value
			 * [4] - case sensitivity
			 *
			 * Note: Attributes can be negated with a "!" prefix to their name
			 */
			if ( $m[4] !== '' ) {
				preg_match_all(
					"/\[@?(!?[\w:-]+)(?:([!*^$|~]?=)[\"']?(.*?)[\"']?)?(?:\s+?([iIsS])?)?\]/is",
					trim( $m[4] ),
					$attributes,
					PREG_SET_ORDER
				);

// Replace element by array.
				$m[4] = array();

foreach ( $attributes as $att ) {
					// Skip empty matches.
					if ( trim( $att[0] ) === '' ) {
						continue; }

$inverted = ( isset( $att[1][0] ) && $att[1][0] === '!' );
					$m[4][]   = array(
						$inverted ? substr( $att[1], 1 ) : $att[1], // Name
						( isset( $att[2] ) ) ? $att[2] : '', // Expression
						( isset( $att[3] ) ) ? $att[3] : '', // Value
						$inverted, // Inverted Flag
						( isset( $att[4] ) ) ? strtolower( $att[4] ) : '', // Case-Sensitivity
					);
				}
			}

// Sanitize Separator.
			if ( $m[5] !== '' && trim( $m[5] ) === '' ) { // Descendant Separator
				$m[5] = ' ';
			} else { // Other Separator
				$m[5] = trim( $m[5] );
			}

// Clear Separator if it's a Selector List.
			if ( $is_list = ( $m[5] === ',' ) ) {
				$m[5] = ''; }

// Remove full match before adding to results.
			array_shift( $m );
			$result[] = $m;

if ( $is_list ) { // Selector List
				$selectors[] = $result;
				$result      = array();
			}
		}

if ( count( $result ) > 0 ) {
			$selectors[] = $result; }
		return $selectors;
	}

function __set( $name, $value ) {
		global $debug_object;
		if ( is_object( $debug_object ) ) {
			$debug_object->debug_log_entry( 1 ); }

switch ( $name ) {
			case 'outertext':
				return $this->_[ HDOM_INFO_OUTER ] = $value;
			case 'innertext':
				if ( isset( $this->_[ HDOM_INFO_TEXT ] ) ) {
					return $this->_[ HDOM_INFO_TEXT ] = $value;
				}
				return $this->_[ HDOM_INFO_INNER ] = $value;
		}

if ( ! isset( $this->attr[ $name ] ) ) {
			$this->_[ HDOM_INFO_SPACE ][] = array( ' ', '', '' );
			$this->_[ HDOM_INFO_QUOTE ][] = HDOM_QUOTE_DOUBLE;
		}

$this->attr[ $name ] = $value;
	}

function __isset( $name ) {
		switch ( $name ) {
			case 'outertext':
				return true;
			case 'innertext':
				return true;
			case 'plaintext':
				return true;
		}
		// no value attr: nowrap, checked selected...
		return ( array_key_exists( $name, $this->attr ) ) ? true : isset( $this->attr[ $name ] );
	}

function __unset( $name ) {
		if ( isset( $this->attr[ $name ] ) ) {
			unset( $this->attr[ $name ] ); }
	}

function convert_text( $text ) {
		global $debug_object;
		if ( is_object( $debug_object ) ) {
			$debug_object->debug_log_entry( 1 ); }

$converted_text = $text;

$sourceCharset = '';
		$targetCharset = '';

if ( $this->dom ) {
			$sourceCharset = strtoupper( $this->dom->_charset );
			$targetCharset = strtoupper( $this->dom->_target_charset );
		}

if ( is_object( $debug_object ) ) {
			$debug_object->debug_log(
				3,
				'source charset: '
				. $sourceCharset
				. ' target charaset: '
				. $targetCharset
			);
		}

if ( ! empty( $sourceCharset )
			&& ! empty( $targetCharset )
			&& ( strcasecmp( $sourceCharset, $targetCharset ) != 0 ) ) {
			// Check if the reported encoding could have been incorrect and the text is actually already UTF-8.
			if ( ( strcasecmp( $targetCharset, 'UTF-8' ) == 0 )
				&& ( $this->is_utf8( $text ) ) ) {
				$converted_text = $text;
			} else {
				$converted_text = iconv( $sourceCharset, $targetCharset, $text );
			}
		}

// Lets make sure that we don't have that silly BOM issue with any of the utf-8 text we output.
		if ( $targetCharset === 'UTF-8' ) {
			if ( substr( $converted_text, 0, 3 ) === "\xef\xbb\xbf" ) {
				$converted_text = substr( $converted_text, 3 );
			}

if ( substr( $converted_text, -3 ) === "\xef\xbb\xbf" ) {
				$converted_text = substr( $converted_text, 0, -3 );
			}
		}

return $converted_text;
	}

static function is_utf8( $str ) {
		$c    = 0;
		$b    = 0;
		$bits = 0;
		$len  = strlen( $str );
		for ( $i = 0; $i < $len; $i++ ) {
			$c = ord( $str[ $i ] );
			if ( $c > 128 ) {
				if ( ( $c >= 254 ) ) {
					return false; } elseif ( $c >= 252 ) {
					$bits = 6; } elseif ( $c >= 248 ) {
						$bits = 5; } elseif ( $c >= 240 ) {
						$bits = 4; } elseif ( $c >= 224 ) {
							$bits = 3; } elseif ( $c >= 192 ) {
							$bits = 2; } else {
								return false; }
							if ( ( $i + $bits ) > $len ) {
								return false; }
							while ( $bits > 1 ) {
								++$i;
								$b = ord( $str[ $i ] );
								if ( $b < 128 || $b > 191 ) {
									return false; }
								--$bits;
							}
			}
		}
		return true;
	}

function get_display_size() {
		global $debug_object;

$width  = -1;
		$height = -1;

if ( $this->tag !== 'img' ) {
			return false;
		}

// See if there is aheight or width attribute in the tag itself.
		if ( isset( $this->attr['width'] ) ) {
			$width = $this->attr['width'];
		}

if ( isset( $this->attr['height'] ) ) {
			$height = $this->attr['height'];
		}

// Now look for an inline style.
		if ( isset( $this->attr['style'] ) ) {
			// Thanks to user gnarf from stackoverflow for this regular expression.
			$attributes = array();

preg_match_all(
				'/([\w-]+)\s*:\s*([^;]+)\s*;?/',
				$this->attr['style'],
				$matches,
				PREG_SET_ORDER
			);

foreach ( $matches as $match ) {
				$attributes[ $match[1] ] = $match[2];
			}

// If there is a width in the style attributes:.
			if ( isset( $attributes['width'] ) && $width == -1 ) {
				// check that the last two characters are px (pixels)
				if ( strtolower( substr( $attributes['width'], -2 ) ) === 'px' ) {
					$proposed_width = substr( $attributes['width'], 0, -2 );
					// Now make sure that it's an integer and not something stupid.
					if ( filter_var( $proposed_width, FILTER_VALIDATE_INT ) ) {
						$width = $proposed_width;
					}
				}
			}

// If there is a width in the style attributes:.
			if ( isset( $attributes['height'] ) && $height == -1 ) {
				// check that the last two characters are px (pixels)
				if ( strtolower( substr( $attributes['height'], -2 ) ) == 'px' ) {
					$proposed_height = substr( $attributes['height'], 0, -2 );
					// Now make sure that it's an integer and not something stupid.
					if ( filter_var( $proposed_height, FILTER_VALIDATE_INT ) ) {
						$height = $proposed_height;
					}
				}
			}
		}

// Future enhancement:.
		// Look in the tag to see if there is a class or id specified that has.
		// a height or width attribute to it.

// Far future enhancement.
		// Look at all the parent tags of this image to see if they specify a.
		// class or id that has an img selector that specifies a height or width.
		// Note that in this case, the class or id will have the img subselector.
		// for it to apply to the image.

// ridiculously far future development.
		// If the class or id is specified in a SEPARATE css file thats not on.
		// the page, go get it and do what we were just doing for the ones on.
		// the page.

$result = array(
			'height' => $height,
			'width'  => $width,
		);

return $result;
	}

function save( $filepath = '' ) {
		$ret = $this->outertext();

if ( $filepath !== '' ) {
			file_put_contents( $filepath, $ret, LOCK_EX );
		}

return $ret;
	}

function addClass( $class ) {
		if ( is_string( $class ) ) {
			$class = explode( ' ', $class );
		}

if ( is_array( $class ) ) {
			foreach ( $class as $c ) {
				if ( isset( $this->class ) ) {
					if ( $this->hasClass( $c ) ) {
						continue;
					} else {
						$this->class .= ' ' . $c;
					}
				} else {
					$this->class = $c;
				}
			}
		} elseif ( is_object( $debug_object ) ) {
				$debug_object->debug_log( 2, 'Invalid type: ', gettype( $class ) );
		}
	}

function hasClass( $class ) {
		if ( is_string( $class ) ) {
			if ( isset( $this->class ) ) {
				return in_array( $class, explode( ' ', $this->class ), true );
			}
		} elseif ( is_object( $debug_object ) ) {
				$debug_object->debug_log( 2, 'Invalid type: ', gettype( $class ) );
		}

return false;
	}

function removeClass( $class = null ) {
		if ( ! isset( $this->class ) ) {
			return;
		}

if ( is_null( $class ) ) {
			$this->removeAttribute( 'class' );
			return;
		}

if ( is_string( $class ) ) {
			$class = explode( ' ', $class );
		}

if ( is_array( $class ) ) {
			$class = array_diff( explode( ' ', $this->class ), $class );
			if ( empty( $class ) ) {
				$this->removeAttribute( 'class' );
			} else {
				$this->class = implode( ' ', $class );
			}
		}
	}

function getAllAttributes() {
		return $this->attr;
	}

function getAttribute( $name ) {
		return $this->__get( $name );
	}

function setAttribute( $name, $value ) {
		$this->__set( $name, $value );
	}

function hasAttribute( $name ) {
		return $this->__isset( $name );
	}

function removeAttribute( $name ) {
		$this->__set( $name, null );
	}

function remove() {
		if ( $this->parent ) {
			$this->parent->removeChild( $this );
		}
	}

function removeChild( $node ) {
		$nidx = array_search( $node, $this->nodes, true );
		$cidx = array_search( $node, $this->children, true );
		$didx = array_search( $node, $this->dom->nodes, true );

if ( $nidx !== false && $cidx !== false && $didx !== false ) {

foreach ( $node->children as $child ) {
				$node->removeChild( $child );
			}

foreach ( $node->nodes as $entity ) {
				$enidx = array_search( $entity, $node->nodes, true );
				$edidx = array_search( $entity, $node->dom->nodes, true );

if ( $enidx !== false && $edidx !== false ) {
					unset( $node->nodes[ $enidx ] );
					unset( $node->dom->nodes[ $edidx ] );
				}
			}

unset( $this->nodes[ $nidx ] );
			unset( $this->children[ $cidx ] );
			unset( $this->dom->nodes[ $didx ] );

$node->clear();

}
	}

function getElementById( $id ) {
		return $this->find( "#$id", 0 );
	}

function getElementsById( $id, $idx = null ) {
		return $this->find( "#$id", $idx );
	}

function getElementByTagName( $name ) {
		return $this->find( $name, 0 );
	}

function getElementsByTagName( $name, $idx = null ) {
		return $this->find( $name, $idx );
	}

function parentNode() {
		return $this->parent();
	}

function childNodes( $idx = -1 ) {
		return $this->children( $idx );
	}

function firstChild() {
		return $this->first_child();
	}

function lastChild() {
		return $this->last_child();
	}

function nextSibling() {
		return $this->next_sibling();
	}

function previousSibling() {
		return $this->prev_sibling();
	}

function hasChildNodes() {
		return $this->has_child();
	}

function nodeName() {
		return $this->tag;
	}

function appendChild( $node ) {
		$node->parent( $this );
		return $node;
	}
}

class seedprod_simple_html_dom {

public $root      = null;
	public $nodes     = array();
	public $callback  = null;
	public $lowercase = false;
	public $original_size;
	public $size;

protected $pos;
	protected $doc;
	protected $char;

protected $cursor;
	protected $parent;
	protected $noise       = array();
	protected $token_blank = " \t\r\n";
	protected $token_equal = ' =/>';
	protected $token_slash = " />\r\n\t";
	protected $token_attr  = ' >';

public $_charset        = '';
	public $_target_charset = '';

protected $default_br_text = '';

public $default_span_text = '';

protected $self_closing_tags     = array(
		'area'   => 1,
		'base'   => 1,
		'br'     => 1,
		'col'    => 1,
		'embed'  => 1,
		'hr'     => 1,
		'img'    => 1,
		'input'  => 1,
		'link'   => 1,
		'meta'   => 1,
		'param'  => 1,
		'source' => 1,
		'track'  => 1,
		'wbr'    => 1,
	);
	protected $block_tags            = array(
		'body'  => 1,
		'div'   => 1,
		'form'  => 1,
		'root'  => 1,
		'span'  => 1,
		'table' => 1,
	);
	protected $optional_closing_tags = array(
		// Not optional, see.
		// https://www.w3.org/TR/html/textlevel-semantics.html#the-b-element
		'b'        => array( 'b' => 1 ),
		'dd'       => array(
			'dd' => 1,
			'dt' => 1,
		),
		// Not optional, see.
		// https://www.w3.org/TR/html/grouping-content.html#the-dl-element
		'dl'       => array(
			'dd' => 1,
			'dt' => 1,
		),
		'dt'       => array(
			'dd' => 1,
			'dt' => 1,
		),
		'li'       => array( 'li' => 1 ),
		'optgroup' => array(
			'optgroup' => 1,
			'option'   => 1,
		),
		'option'   => array(
			'optgroup' => 1,
			'option'   => 1,
		),
		'p'        => array( 'p' => 1 ),
		'rp'       => array(
			'rp' => 1,
			'rt' => 1,
		),
		'rt'       => array(
			'rp' => 1,
			'rt' => 1,
		),
		'td'       => array(
			'td' => 1,
			'th' => 1,
		),
		'th'       => array(
			'td' => 1,
			'th' => 1,
		),
		'tr'       => array(
			'td' => 1,
			'th' => 1,
			'tr' => 1,
		),
	);

$this->_target_charset = $target_charset;
	}

function __destruct() {
		$this->clear();
	}

function load(
		$str,
		$lowercase = true,
		$stripRN = true,
		$defaultBRText = SEEDPROD_DEFAULT_BR_TEXT,
		$defaultSpanText = SEEDPROD_DEFAULT_SPAN_TEXT,
		$options = 0
	) {
		global $debug_object;

// prepare.
		$this->prepare( $str, $lowercase, $defaultBRText, $defaultSpanText );

// Per sourceforge http://sourceforge.net/tracker/?func=detail&aid=2949097&group_id=218559&atid=1044037
		// Script tags removal now preceeds style tag removal.
		// strip out <script> tags.
		$this->remove_noise( "'<\s*script[^>]*[^/]>(.*?)<\s*/\s*script\s*>'is" );
		$this->remove_noise( "'<\s*script\s*>(.*?)<\s*/\s*script\s*>'is" );

// strip out the \r \n's if we are told to.
		if ( $stripRN ) {
			$this->doc = str_replace( "\r", ' ', $this->doc );
			$this->doc = str_replace( "\n", ' ', $this->doc );

// set the length of content since we have changed it.
			$this->size = strlen( $this->doc );
		}

// strip out cdata.
		$this->remove_noise( "'<!\[CDATA\[(.*?)\]\]>'is", true );
		// strip out comments.
		$this->remove_noise( "''is" );
		// strip out <style> tags.
		$this->remove_noise( "'<\s*style[^>]*[^/]>(.*?)<\s*/\s*style\s*>'is" );
		$this->remove_noise( "'<\s*style\s*>(.*?)<\s*/\s*style\s*>'is" );
		// strip out preformatted tags.
		$this->remove_noise( "'<\s*(?:code)[^>]*>(.*?)<\s*/\s*(?:code)\s*>'is" );
		// strip out server side scripts.
		$this->remove_noise( "'(<\?)(.*?)(\?>)'s", true );

if ( $options & HDOM_SMARTY_AS_TEXT ) { // Strip Smarty scripts
			$this->remove_noise( "'(\{\w)(.*?)(\})'s", true );
		}

// parsing.
		$this->parse();
		// end.
		$this->root->_[ HDOM_INFO_END ] = $this->cursor;
		$this->parse_charset();

// make load function chainable.
		return $this;
	}

function load_file() {
		$args = func_get_args();

if ( ( $doc = call_user_func_array( 'file_get_contents', $args ) ) !== false ) {
			$this->load( $doc, true );
		} else {
			return false;
		}
	}

function set_callback( $function_name ) {
		$this->callback = $function_name;
	}

function remove_callback() {
		$this->callback = null;
	}

function save( $filepath = '' ) {
		$ret = $this->root->innertext();
		if ( $filepath !== '' ) {
			file_put_contents( $filepath, $ret, LOCK_EX ); }
		return $ret;
	}

function find( $selector, $idx = null, $lowercase = false ) {
		return $this->root->find( $selector, $idx, $lowercase );
	}

function clear() {
		if ( isset( $this->nodes ) ) {
			foreach ( $this->nodes as $n ) {
				$n->clear();
				$n = null;
			}
		}

// This add next line is documented in the sourceforge repository.
		// 2977248 as a fix for ongoing memory leaks that occur even with the.
		// use of clear.
		if ( isset( $this->children ) ) {
			foreach ( $this->children as $n ) {
				$n->clear();
				$n = null;
			}
		}

if ( isset( $this->parent ) ) {
			$this->parent->clear();
			unset( $this->parent );
		}

if ( isset( $this->root ) ) {
			$this->root->clear();
			unset( $this->root );
		}

unset( $this->doc );
		unset( $this->noise );
	}

function dump( $show_attr = true ) {
		$this->root->dump( $show_attr );
	}

protected function prepare(
		$str,
		$lowercase = true,
		$defaultBRText = SEEDPROD_DEFAULT_BR_TEXT,
		$defaultSpanText = SEEDPROD_DEFAULT_SPAN_TEXT
	) {
		$this->clear();

$this->doc                        = trim( $str );
		$this->size                       = strlen( $this->doc );
		$this->original_size              = $this->size; // original size of the html
		$this->pos                        = 0;
		$this->cursor                     = 1;
		$this->noise                      = array();
		$this->nodes                      = array();
		$this->lowercase                  = $lowercase;
		$this->default_br_text            = $defaultBRText;
		$this->default_span_text          = $defaultSpanText;
		$this->root                       = new seedprod_seedprod_simple_html_dom_node( $this );
		$this->root->tag                  = 'root';
		$this->root->_[ HDOM_INFO_BEGIN ] = -1;
		$this->root->nodetype             = HDOM_TYPE_ROOT;
		$this->parent                     = $this->root;
		if ( $this->size > 0 ) {
			$this->char = $this->doc[0]; }
	}

protected function parse() {
		while ( true ) {
			// Read next tag if there is no text between current position and the.
			// next opening tag.
			if ( ( $s = $this->copy_until_char( '<' ) ) === '' ) {
				if ( $this->read_tag() ) {
					continue;
				} else {
					return true;
				}
			}

// Add a text node for text between tags.
			$node = new seedprod_seedprod_simple_html_dom_node( $this );
			++$this->cursor;
			$node->_[ HDOM_INFO_TEXT ] = $s;
			$this->link_nodes( $node, false );
		}
	}

protected function parse_charset() {
		global $debug_object;

$charset = null;

if ( function_exists( 'get_last_retrieve_url_contents_content_type' ) ) {
			$contentTypeHeader = get_last_retrieve_url_contents_content_type();
			$success           = preg_match( '/charset=(.+)/', $contentTypeHeader, $matches );
			if ( $success ) {
				$charset = $matches[1];
				if ( is_object( $debug_object ) ) {
					$debug_object->debug_log(
						2,
						'header content-type found charset of: '
						. $charset
					);
				}
			}
		}

if ( empty( $charset ) ) {
			// https://www.w3.org/TR/html/document-metadata.html#statedef-http-equiv-content-type
			$el = $this->root->find( 'meta[http-equiv=Content-Type]', 0, true );

if ( ! empty( $el ) ) {
				$fullvalue = $el->content;
				if ( is_object( $debug_object ) ) {
					$debug_object->debug_log(
						2,
						'meta content-type tag found'
						. $fullvalue
					);
				}

if ( ! empty( $fullvalue ) ) {
					$success = preg_match(
						'/charset=(.+)/i',
						$fullvalue,
						$matches
					);

if ( $success ) {
						$charset = $matches[1];
					} else {
						// If there is a meta tag, and they don't specify the.
						// character set, research says that it's typically.
						// ISO-8859-1.
						if ( is_object( $debug_object ) ) {
							$debug_object->debug_log(
								2,
								'meta content-type tag couldn\'t be parsed. using iso-8859 default.'
							);
						}

$charset = 'ISO-8859-1';
					}
				}
			}
		}

if ( empty( $charset ) ) {
			// https://www.w3.org/TR/html/document-metadata.html#character-encoding-declaration
			if ( $meta = $this->root->find( 'meta[charset]', 0 ) ) {
				$charset = $meta->charset;
				if ( is_object( $debug_object ) ) {
					$debug_object->debug_log( 2, 'meta charset: ' . $charset );
				}
			}
		}

if ( empty( $charset ) ) {
			// Try to guess the charset based on the content.
			// Requires Multibyte String (mbstring) support (optional)
			if ( function_exists( 'mb_detect_encoding' ) ) {
				/**
				 * mb_detect_encoding() is not intended to distinguish between
				 * charsets, especially single-byte charsets. Its primary
				 * purpose is to detect which multibyte encoding is in use,
				 * i.e. UTF-8, UTF-16, shift-JIS, etc.
				 *
				 * -- https://bugs.php.net/bug.php?id=38138
				 *
				 * Adding both CP1251/ISO-8859-5 and CP1252/ISO-8859-1 will
				 * always result in CP1251/ISO-8859-5 and vice versa.
				 *
				 * Thus, only detect if it's either UTF-8 or CP1252/ISO-8859-1
				 * to stay compatible.
				 */
				$encoding = mb_detect_encoding(
					$this->doc,
					array( 'UTF-8', 'CP1252', 'ISO-8859-1' )
				);

if ( $encoding === 'CP1252' || $encoding === 'ISO-8859-1' ) {
					// Due to a limitation of mb_detect_encoding.
					// 'CP1251'/'ISO-8859-5' will be detected as.
					// 'CP1252'/'ISO-8859-1'. This will cause iconv to fail, in.
					// which case we can simply assume it is the other charset.
					if ( ! @iconv( 'CP1252', 'UTF-8', $this->doc ) ) {
						$encoding = 'CP1251';
					}
				}

if ( $encoding !== false ) {
					$charset = $encoding;
					if ( is_object( $debug_object ) ) {
						$debug_object->debug_log( 2, 'mb_detect: ' . $charset );
					}
				}
			}
		}

if ( empty( $charset ) ) {
			// Assume it's UTF-8 as it is the most likely charset to be used.
			$charset = 'UTF-8';
			if ( is_object( $debug_object ) ) {
				$debug_object->debug_log( 2, 'No match found, assume ' . $charset );
			}
		}

// Since CP1252 is a superset, if we get one of it's subsets, we want.
		// it instead.
		if ( ( strtolower( $charset ) == 'iso-8859-1' )
			|| ( strtolower( $charset ) == 'latin1' )
			|| ( strtolower( $charset ) == 'latin-1' ) ) {
			$charset = 'CP1252';
			if ( is_object( $debug_object ) ) {
				$debug_object->debug_log(
					2,
					'replacing ' . $charset . ' with CP1252 as its a superset'
				);
			}
		}

if ( is_object( $debug_object ) ) {
			$debug_object->debug_log( 1, 'EXIT - ' . $charset );
		}

return $this->_charset = $charset;
	}

protected function read_tag() {
		// Set end position if no further tags found.
		if ( $this->char !== '<' ) {
			$this->root->_[ HDOM_INFO_END ] = $this->cursor;
			return false;
		}

$begin_tag_pos = $this->pos;
		$this->char    = ( ++$this->pos < $this->size ) ? $this->doc[ $this->pos ] : null; // next

// end tag.
		if ( $this->char === '/' ) {
			$this->char = ( ++$this->pos < $this->size ) ? $this->doc[ $this->pos ] : null; // next

// Skip whitespace in end tags (i.e. in "</   html>")
			$this->skip( $this->token_blank );
			$tag = $this->copy_until_char( '>' );

// Skip attributes in end tags.
			if ( ( $pos = strpos( $tag, ' ' ) ) !== false ) {
				$tag = substr( $tag, 0, $pos );
			}

$parent_lower = strtolower( $this->parent->tag );
			$tag_lower    = strtolower( $tag );

// The end tag is supposed to close the parent tag. Handle situations.
			// when it doesn't.
			if ( $parent_lower !== $tag_lower ) {
				// Parent tag does not have to be closed necessarily (optional closing tag)
				// Current tag is a block tag, so it may close an ancestor.
				if ( isset( $this->optional_closing_tags[ $parent_lower ] )
					&& isset( $this->block_tags[ $tag_lower ] ) ) {

$this->parent->_[ HDOM_INFO_END ] = 0;
					$org_parent                       = $this->parent;

// Traverse ancestors to find a matching opening tag.
					// Stop at root node.
					while ( ( $this->parent->parent )
						&& strtolower( $this->parent->tag ) !== $tag_lower
					) {
						$this->parent = $this->parent->parent;
					}

// If we don't have a match add current tag as text node.
					if ( strtolower( $this->parent->tag ) !== $tag_lower ) {
						$this->parent = $org_parent; // restore origonal parent

if ( $this->parent->parent ) {
							$this->parent = $this->parent->parent;
						}

$this->parent->_[ HDOM_INFO_END ] = $this->cursor;
						return $this->as_text_node( $tag );
					}
				} elseif ( ( $this->parent->parent )
					&& isset( $this->block_tags[ $tag_lower ] )
				) {
					// Grandparent exists and current tag is a block tag, so our.
					// parent doesn't have an end tag.
					$this->parent->_[ HDOM_INFO_END ] = 0; // No end tag
					$org_parent                       = $this->parent;

// If we don't have a match add current tag as text node.
					if ( strtolower( $this->parent->tag ) !== $tag_lower ) {
						$this->parent                     = $org_parent; // restore origonal parent
						$this->parent->_[ HDOM_INFO_END ] = $this->cursor;
						return $this->as_text_node( $tag );
					}
				} elseif ( ( $this->parent->parent )
					&& strtolower( $this->parent->parent->tag ) === $tag_lower
				) { // Grandparent exists and current tag closes it
					$this->parent->_[ HDOM_INFO_END ] = 0;
					$this->parent                     = $this->parent->parent;
				} else { // Random tag, add as text node
					return $this->as_text_node( $tag );
				}
			}

// Set end position of parent tag to current cursor position.
			$this->parent->_[ HDOM_INFO_END ] = $this->cursor;

if ( $this->parent->parent ) {
				$this->parent = $this->parent->parent;
			}

$this->char = ( ++$this->pos < $this->size ) ? $this->doc[ $this->pos ] : null; // next
			return true;
		}

// start tag.
		$node                       = new seedprod_seedprod_simple_html_dom_node( $this );
		$node->_[ HDOM_INFO_BEGIN ] = $this->cursor;
		++$this->cursor;
		$tag             = $this->copy_until( $this->token_slash ); // Get tag name
		$node->tag_start = $begin_tag_pos;

// doctype, cdata & comments...
		// <!DOCTYPE html>.
		// <![CDATA[ ... ]]>.
		// .
		if ( isset( $tag[0] ) && $tag[0] === '!' ) {
			$node->_[ HDOM_INFO_TEXT ] = '<' . $tag . $this->copy_until_char( '>' );

if ( isset( $tag[2] ) && $tag[1] === '-' && $tag[2] === '-' ) { // Comment ("<!--")
				$node->nodetype = HDOM_TYPE_COMMENT;
				$node->tag      = 'comment';
			} else { // Could be doctype or CDATA but we don't care
				$node->nodetype = HDOM_TYPE_UNKNOWN;
				$node->tag      = 'unknown';
			}

if ( $this->char === '>' ) {
				$node->_[ HDOM_INFO_TEXT ] .= '>'; }

$this->link_nodes( $node, true );
			$this->char = ( ++$this->pos < $this->size ) ? $this->doc[ $this->pos ] : null; // next
			return true;
		}

// The start tag cannot contain another start tag, if so add as text.
		// i.e. "<<html>".
		if ( $pos = strpos( $tag, '<' ) !== false ) {
			$tag                       = '<' . substr( $tag, 0, -1 );
			$node->_[ HDOM_INFO_TEXT ] = $tag;
			$this->link_nodes( $node, false );
			$this->char = $this->doc[ --$this->pos ]; // prev
			return true;
		}

// Handle invalid tag names (i.e. "<html#doc>")
		if ( ! preg_match( '/^\w[\w:-]*$/', $tag ) ) {
			$node->_[ HDOM_INFO_TEXT ] = '<' . $tag . $this->copy_until( '<>' );

// Next char is the beginning of a new tag, don't touch it.
			if ( $this->char === '<' ) {
				$this->link_nodes( $node, false );
				return true;
			}

// Next char closes current tag, add and be done with it.
			if ( $this->char === '>' ) {
				$node->_[ HDOM_INFO_TEXT ] .= '>'; }
			$this->link_nodes( $node, false );
			$this->char = ( ++$this->pos < $this->size ) ? $this->doc[ $this->pos ] : null; // next
			return true;
		}

// begin tag, add new node.
		$node->nodetype = HDOM_TYPE_ELEMENT;
		$tag_lower      = strtolower( $tag );
		$node->tag      = ( $this->lowercase ) ? $tag_lower : $tag;

// handle optional closing tags.
		if ( isset( $this->optional_closing_tags[ $tag_lower ] ) ) {
			// Traverse ancestors to close all optional closing tags.
			while ( isset( $this->optional_closing_tags[ $tag_lower ][ strtolower( $this->parent->tag ) ] ) ) {
				$this->parent->_[ HDOM_INFO_END ] = 0;
				$this->parent                     = $this->parent->parent;
			}
			$node->parent = $this->parent;
		}

$guard = 0; // prevent infinity loop

// [0] Space between tag and first attribute.
		$space = array( $this->copy_skip( $this->token_blank ), '', '' );

// attributes.
		do {
			// Everything until the first equal sign should be the attribute name.
			$name = $this->copy_until( $this->token_equal );

if ( $name === '' && $this->char !== null && $space[0] === '' ) {
				break;
			}

if ( $guard === $this->pos ) { // Escape infinite loop
				$this->char = ( ++$this->pos < $this->size ) ? $this->doc[ $this->pos ] : null; // next
				continue;
			}

$guard = $this->pos;

// handle endless '<'.
			// Out of bounds before the tag ended.
			if ( $this->pos >= $this->size - 1 && $this->char !== '>' ) {
				$node->nodetype            = HDOM_TYPE_TEXT;
				$node->_[ HDOM_INFO_END ]  = 0;
				$node->_[ HDOM_INFO_TEXT ] = '<' . $tag . $space[0] . $name;
				$node->tag                 = 'text';
				$this->link_nodes( $node, false );
				return true;
			}

// handle mismatch '<'.
			// Attributes cannot start after opening tag.
			if ( $this->doc[ $this->pos - 1 ] == '<' ) {
				$node->nodetype            = HDOM_TYPE_TEXT;
				$node->tag                 = 'text';
				$node->attr                = array();
				$node->_[ HDOM_INFO_END ]  = 0;
				$node->_[ HDOM_INFO_TEXT ] = substr(
					$this->doc,
					$begin_tag_pos,
					$this->pos - $begin_tag_pos - 1
				);
				$this->pos                -= 2;
				$this->char                = ( ++$this->pos < $this->size ) ? $this->doc[ $this->pos ] : null; // next
				$this->link_nodes( $node, false );
				return true;
			}

if ( $name !== '/' && $name !== '' ) { // this is a attribute name
				// [1] Whitespace after attribute name.
				$space[1] = $this->copy_skip( $this->token_blank );

$name = $this->restore_noise( $name ); // might be a noisy name

if ( $this->lowercase ) {
					$name = strtolower( $name ); }

if ( $this->char === '=' ) { // attribute with value
					$this->char = ( ++$this->pos < $this->size ) ? $this->doc[ $this->pos ] : null; // next
					$this->parse_attr( $node, $name, $space ); // get attribute value
				} else {
					// no value attr: nowrap, checked selected...
					$node->_[ HDOM_INFO_QUOTE ][] = HDOM_QUOTE_NO;
					$node->attr[ $name ]          = true;
					if ( $this->char != '>' ) {
						$this->char = $this->doc[ --$this->pos ]; } // prev
				}

$node->_[ HDOM_INFO_SPACE ][] = $space;

// prepare for next attribute.
				$space = array(
					$this->copy_skip( $this->token_blank ),
					'',
					'',
				);
			} else { // no more attributes
				break;
			}
		} while ( $this->char !== '>' && $this->char !== '/' ); // go until the tag ended

$this->link_nodes( $node, true );
		$node->_[ HDOM_INFO_ENDSPACE ] = $space[0];

// handle empty tags (i.e. "<div/>")
		if ( $this->copy_until_char( '>' ) === '/' ) {
			$node->_[ HDOM_INFO_ENDSPACE ] .= '/';
			$node->_[ HDOM_INFO_END ]       = 0;
		} else {
			// reset parent.
			if ( ! isset( $this->self_closing_tags[ strtolower( $node->tag ) ] ) ) {
				$this->parent = $node;
			}
		}

$this->char = ( ++$this->pos < $this->size ) ? $this->doc[ $this->pos ] : null; // next

// If it's a BR tag, we need to set it's text to the default text.
		// This way when we see it in plaintext, we can generate formatting that the user wants.
		// since a br tag never has sub nodes, this works well.
		if ( $node->tag === 'br' ) {
			$node->_[ HDOM_INFO_INNER ] = $this->default_br_text;
		}

return true;
	}

protected function parse_attr( $node, $name, &$space ) {
		$is_duplicate = isset( $node->attr[ $name ] );

if ( ! $is_duplicate ) { // Copy whitespace between "=" and value
			$space[2] = $this->copy_skip( $this->token_blank );
		}

switch ( $this->char ) {
			case '"':
				$quote_type = HDOM_QUOTE_DOUBLE;
				$this->char = ( ++$this->pos < $this->size ) ? $this->doc[ $this->pos ] : null; // next
				$value      = $this->copy_until_char( '"' );
				$this->char = ( ++$this->pos < $this->size ) ? $this->doc[ $this->pos ] : null; // next
				break;
			case '\'':
				$quote_type = HDOM_QUOTE_SINGLE;
				$this->char = ( ++$this->pos < $this->size ) ? $this->doc[ $this->pos ] : null; // next
				$value      = $this->copy_until_char( '\'' );
				$this->char = ( ++$this->pos < $this->size ) ? $this->doc[ $this->pos ] : null; // next
				break;
			default:
				$quote_type = HDOM_QUOTE_NO;
				$value      = $this->copy_until( $this->token_attr );
		}

$value = $this->restore_noise( $value );

// PaperG: Attributes should not have \r or \n in them, that counts as.
		// html whitespace.
		$value = str_replace( "\r", '', $value );
		$value = str_replace( "\n", '', $value );

// PaperG: If this is a "class" selector, lets get rid of the preceeding.
		// and trailing space since some people leave it in the multi class case.
		if ( $name === 'class' ) {
			$value = trim( $value );
		}

if ( ! $is_duplicate ) {
			$node->_[ HDOM_INFO_QUOTE ][] = $quote_type;
			$node->attr[ $name ]          = $value;
		}
	}

protected function link_nodes( &$node, $is_child ) {
		$node->parent          = $this->parent;
		$this->parent->nodes[] = $node;
		if ( $is_child ) {
			$this->parent->children[] = $node;
		}
	}

protected function as_text_node( $tag ) {
		$node = new seedprod_seedprod_simple_html_dom_node( $this );
		++$this->cursor;
		$node->_[ HDOM_INFO_TEXT ] = '</' . $tag . '>';
		$this->link_nodes( $node, false );
		$this->char = ( ++$this->pos < $this->size ) ? $this->doc[ $this->pos ] : null; // next
		return true;
	}

protected function skip( $chars ) {
		$this->pos += strspn( $this->doc, $chars, $this->pos );
		$this->char = ( $this->pos < $this->size ) ? $this->doc[ $this->pos ] : null; // next
	}

protected function copy_skip( $chars ) {
		$pos        = $this->pos;
		$len        = strspn( $this->doc, $chars, $pos );
		$this->pos += $len;
		$this->char = ( $this->pos < $this->size ) ? $this->doc[ $this->pos ] : null; // next
		if ( $len === 0 ) {
			return ''; }
		return substr( $this->doc, $pos, $len );
	}

protected function copy_until( $chars ) {
		$pos        = $this->pos;
		$len        = strcspn( $this->doc, $chars, $pos );
		$this->pos += $len;
		$this->char = ( $this->pos < $this->size ) ? $this->doc[ $this->pos ] : null; // next
		return substr( $this->doc, $pos, $len );
	}

protected function copy_until_char( $char ) {
		if ( $this->char === null ) {
			return ''; }

if ( ( $pos = strpos( $this->doc, $char, $this->pos ) ) === false ) {
			$ret        = substr( $this->doc, $this->pos, $this->size - $this->pos );
			$this->char = null;
			$this->pos  = $this->size;
			return $ret;
		}

if ( $pos === $this->pos ) {
			return ''; }

$pos_old    = $this->pos;
		$this->char = $this->doc[ $pos ];
		$this->pos  = $pos;
		return substr( $this->doc, $pos_old, $pos - $pos_old );
	}

protected function remove_noise( $pattern, $remove_tag = false ) {
		global $debug_object;
		if ( is_object( $debug_object ) ) {
			$debug_object->debug_log_entry( 1 ); }

$count = preg_match_all(
			$pattern,
			$this->doc,
			$matches,
			PREG_SET_ORDER | PREG_OFFSET_CAPTURE
		);

for ( $i = $count - 1; $i > -1; --$i ) {
			$key = '___noise___' . sprintf( '% 5d', count( $this->noise ) + 1000 );

if ( is_object( $debug_object ) ) {
				$debug_object->debug_log( 2, 'key is: ' . $key );
			}

$idx                 = ( $remove_tag ) ? 0 : 1; // 0 = entire match, 1 = submatch
			$this->noise[ $key ] = $matches[ $i ][ $idx ][0];
			$this->doc           = substr_replace( $this->doc, $key, $matches[ $i ][ $idx ][1], strlen( $matches[ $i ][ $idx ][0] ) );
		}

// reset the length of content.
		$this->size = strlen( $this->doc );

if ( $this->size > 0 ) {
			$this->char = $this->doc[0];
		}
	}

function restore_noise( $text ) {
		global $debug_object;
		if ( is_object( $debug_object ) ) {
			$debug_object->debug_log_entry( 1 ); }

while ( ( $pos = strpos( $text, '___noise___' ) ) !== false ) {
			// Sometimes there is a broken piece of markup, and we don't GET the.
			// pos+11 etc... token which indicates a problem outside of us...

// todo: "___noise___1000" (or any number with four or more digits)
			// in the DOM causes an infinite loop which could be utilized by.
			// malicious software.
			if ( strlen( $text ) > $pos + 15 ) {
				$key = '___noise___'
				. $text[ $pos + 11 ]
				. $text[ $pos + 12 ]
				. $text[ $pos + 13 ]
				. $text[ $pos + 14 ]
				. $text[ $pos + 15 ];

if ( is_object( $debug_object ) ) {
					$debug_object->debug_log( 2, 'located key of: ' . $key );
				}

if ( isset( $this->noise[ $key ] ) ) {
					$text = substr( $text, 0, $pos )
					. $this->noise[ $key ]
					. substr( $text, $pos + 16 );
				} else {
					// do this to prevent an infinite loop.
					$text = substr( $text, 0, $pos )
					. 'UNDEFINED NOISE FOR KEY: '
					. $key
					. substr( $text, $pos + 16 );
				}
			} else {
				// There is no valid key being given back to us... We must get.
				// rid of the ___noise___ or we will have a problem.
				$text = substr( $text, 0, $pos )
				. 'NO NUMERIC NOISE KEY'
				. substr( $text, $pos + 11 );
			}
		}
		return $text;
	}

function search_noise( $text ) {
		global $debug_object;
		if ( is_object( $debug_object ) ) {
			$debug_object->debug_log_entry( 1 ); }

foreach ( $this->noise as $noiseElement ) {
			if ( strpos( $noiseElement, $text ) !== false ) {
				return $noiseElement;
			}
		}
	}

function __toString() {
		return $this->root->innertext();
	}

function __get( $name ) {
		switch ( $name ) {
			case 'outertext':
				return $this->root->innertext();
			case 'innertext':
				return $this->root->innertext();
			case 'plaintext':
				return $this->root->text();
			case 'charset':
				return $this->_charset;
			case 'target_charset':
				return $this->_target_charset;
		}
	}

function childNodes( $idx = -1 ) {
		return $this->root->childNodes( $idx );
	}

function firstChild() {
		return $this->root->first_child();
	}

function lastChild() {
		return $this->root->last_child();
	}

function createElement( $name, $value = null ) {
		return @seedprod_str_get_html( "<$name>$value</$name>" )->firstChild();
	}

function createTextNode( $value ) {
		return @end( seedprod_str_get_html( $value )->nodes );
	}

function getElementById( $id ) {
		return $this->find( "#$id", 0 );
	}

function getElementsById( $id, $idx = null ) {
		return $this->find( "#$id", $idx );
	}

function getElementByTagName( $name ) {
		return $this->find( $name, 0 );
	}

function getElementsByTagName( $name, $idx = -1 ) {
		return $this->find( $name, $idx );
	}

function loadFile() {
		$args = func_get_args();
		$this->load_file( $args );
	}
}

Editing: simple_html_dom.php

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