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/**
 * SimplePie
 *
 * A PHP-Based RSS and Atom Feed Framework.
 * Takes the hard work out of managing a complete RSS/Atom solution.
 *
 * Copyright (c) 2004-2022, Ryan Parman, Sam Sneddon, Ryan McCue, and contributors
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without modification, are
 * permitted provided that the following conditions are met:
 *
 * 	* Redistributions of source code must retain the above copyright notice, this list of
 * 	  conditions and the following disclaimer.
 *
 * 	* Redistributions in binary form must reproduce the above copyright notice, this list
 * 	  of conditions and the following disclaimer in the documentation and/or other materials
 * 	  provided with the distribution.
 *
 * 	* Neither the name of the SimplePie Team nor the names of its contributors may be used
 * 	  to endorse or promote products derived from this software without specific prior
 * 	  written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS &quot;AS IS&quot; AND ANY EXPRESS
 * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
 * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS
 * AND CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 *
 * @package SimplePie
 * @copyright 2004-2016 Ryan Parman, Sam Sneddon, Ryan McCue
 * @author Ryan Parman
 * @author Sam Sneddon
 * @author Ryan McCue
 * @link http://simplepie.org/ SimplePie
 * @license http://www.opensource.org/licenses/bsd-license.php BSD License
 */

namespace SimplePie;

/**
 * IRI parser/serialiser/normaliser
 *
 * @package SimplePie
 * @subpackage HTTP
 * @author Sam Sneddon
 * @author Steve Minutillo
 * @author Ryan McCue
 * @copyright 2007-2012 Sam Sneddon, Steve Minutillo, Ryan McCue
 * @license http://www.opensource.org/licenses/bsd-license.php
 */
class IRI
{
    /**
     * Scheme
     *
     * @var string
     */
    protected $scheme = null;

    /**
     * User Information
     *
     * @var string
     */
    protected $iuserinfo = null;

    /**
     * ihost
     *
     * @var string
     */
    protected $ihost = null;

    /**
     * Port
     *
     * @var string
     */
    protected $port = null;

    /**
     * ipath
     *
     * @var string
     */
    protected $ipath = &#039;&#039;;

    /**
     * iquery
     *
     * @var string
     */
    protected $iquery = null;

    /**
     * ifragment
     *
     * @var string
     */
    protected $ifragment = null;

    /**
     * Normalization database
     *
     * Each key is the scheme, each value is an array with each key as the IRI
     * part and value as the default value for that part.
     */
    protected $normalization = [
        &#039;acap&#039; =&gt; [
            &#039;port&#039; =&gt; 674
        ],
        &#039;dict&#039; =&gt; [
            &#039;port&#039; =&gt; 2628
        ],
        &#039;file&#039; =&gt; [
            &#039;ihost&#039; =&gt; &#039;localhost&#039;
        ],
        &#039;http&#039; =&gt; [
            &#039;port&#039; =&gt; 80,
            &#039;ipath&#039; =&gt; &#039;/&#039;
        ],
        &#039;https&#039; =&gt; [
            &#039;port&#039; =&gt; 443,
            &#039;ipath&#039; =&gt; &#039;/&#039;
        ],
    ];

    /**
     * Return the entire IRI when you try and read the object as a string
     *
     * @return string
     */
    public function __toString()
    {
        return $this-&gt;get_iri();
    }

    /**
     * Overload __set() to provide access via properties
     *
     * @param string $name Property name
     * @param mixed $value Property value
     */
    public function __set($name, $value)
    {
        if (method_exists($this, &#039;set_&#039; . $name)) {
            call_user_func([$this, &#039;set_&#039; . $name], $value);
        } elseif (
            $name === &#039;iauthority&#039;
            || $name === &#039;iuserinfo&#039;
            || $name === &#039;ihost&#039;
            || $name === &#039;ipath&#039;
            || $name === &#039;iquery&#039;
            || $name === &#039;ifragment&#039;
        ) {
            call_user_func([$this, &#039;set_&#039; . substr($name, 1)], $value);
        }
    }

    /**
     * Overload __get() to provide access via properties
     *
     * @param string $name Property name
     * @return mixed
     */
    public function __get($name)
    {
        // isset() returns false for null, we don&#039;t want to do that
        // Also why we use array_key_exists below instead of isset()
        $props = get_object_vars($this);

        if (
            $name === &#039;iri&#039; ||
            $name === &#039;uri&#039; ||
            $name === &#039;iauthority&#039; ||
            $name === &#039;authority&#039;
        ) {
            $return = $this-&gt;{&quot;get_$name&quot;}();
        } elseif (array_key_exists($name, $props)) {
            $return = $this-&gt;$name;
        }
        // host -&gt; ihost
        elseif (($prop = &#039;i&#039; . $name) &amp;&amp; array_key_exists($prop, $props)) {
            $name = $prop;
            $return = $this-&gt;$prop;
        }
        // ischeme -&gt; scheme
        elseif (($prop = substr($name, 1)) &amp;&amp; array_key_exists($prop, $props)) {
            $name = $prop;
            $return = $this-&gt;$prop;
        } else {
            trigger_error(&#039;Undefined property: &#039; . get_class($this) . &#039;::&#039; . $name, E_USER_NOTICE);
            $return = null;
        }

        if ($return === null &amp;&amp; isset($this-&gt;normalization[$this-&gt;scheme][$name])) {
            return $this-&gt;normalization[$this-&gt;scheme][$name];
        }

        return $return;
    }

    /**
     * Overload __isset() to provide access via properties
     *
     * @param string $name Property name
     * @return bool
     */
    public function __isset($name)
    {
        return method_exists($this, &#039;get_&#039; . $name) || isset($this-&gt;$name);
    }

    /**
     * Overload __unset() to provide access via properties
     *
     * @param string $name Property name
     */
    public function __unset($name)
    {
        if (method_exists($this, &#039;set_&#039; . $name)) {
            call_user_func([$this, &#039;set_&#039; . $name], &#039;&#039;);
        }
    }

    /**
     * Create a new IRI object, from a specified string
     *
     * @param string $iri
     */
    public function __construct($iri = null)
    {
        $this-&gt;set_iri($iri);
    }

    /**
     * Clean up
     */
    public function __destruct()
    {
        $this-&gt;set_iri(null, true);
        $this-&gt;set_path(null, true);
        $this-&gt;set_authority(null, true);
    }

    /**
     * Create a new IRI object by resolving a relative IRI
     *
     * Returns false if $base is not absolute, otherwise an IRI.
     *
     * @param IRI|string $base (Absolute) Base IRI
     * @param IRI|string $relative Relative IRI
     * @return IRI|false
     */
    public static function absolutize($base, $relative)
    {
        if (!($relative instanceof IRI)) {
            $relative = new IRI($relative);
        }
        if (!$relative-&gt;is_valid()) {
            return false;
        } elseif ($relative-&gt;scheme !== null) {
            return clone $relative;
        } else {
            if (!($base instanceof IRI)) {
                $base = new IRI($base);
            }
            if ($base-&gt;scheme !== null &amp;&amp; $base-&gt;is_valid()) {
                if ($relative-&gt;get_iri() !== &#039;&#039;) {
                    if ($relative-&gt;iuserinfo !== null || $relative-&gt;ihost !== null || $relative-&gt;port !== null) {
                        $target = clone $relative;
                        $target-&gt;scheme = $base-&gt;scheme;
                    } else {
                        $target = new IRI();
                        $target-&gt;scheme = $base-&gt;scheme;
                        $target-&gt;iuserinfo = $base-&gt;iuserinfo;
                        $target-&gt;ihost = $base-&gt;ihost;
                        $target-&gt;port = $base-&gt;port;
                        if ($relative-&gt;ipath !== &#039;&#039;) {
                            if ($relative-&gt;ipath[0] === &#039;/&#039;) {
                                $target-&gt;ipath = $relative-&gt;ipath;
                            } elseif (($base-&gt;iuserinfo !== null || $base-&gt;ihost !== null || $base-&gt;port !== null) &amp;&amp; $base-&gt;ipath === &#039;&#039;) {
                                $target-&gt;ipath = &#039;/&#039; . $relative-&gt;ipath;
                            } elseif (($last_segment = strrpos($base-&gt;ipath, &#039;/&#039;)) !== false) {
                                $target-&gt;ipath = substr($base-&gt;ipath, 0, $last_segment + 1) . $relative-&gt;ipath;
                            } else {
                                $target-&gt;ipath = $relative-&gt;ipath;
                            }
                            $target-&gt;ipath = $target-&gt;remove_dot_segments($target-&gt;ipath);
                            $target-&gt;iquery = $relative-&gt;iquery;
                        } else {
                            $target-&gt;ipath = $base-&gt;ipath;
                            if ($relative-&gt;iquery !== null) {
                                $target-&gt;iquery = $relative-&gt;iquery;
                            } elseif ($base-&gt;iquery !== null) {
                                $target-&gt;iquery = $base-&gt;iquery;
                            }
                        }
                        $target-&gt;ifragment = $relative-&gt;ifragment;
                    }
                } else {
                    $target = clone $base;
                    $target-&gt;ifragment = null;
                }
                $target-&gt;scheme_normalization();
                return $target;
            }

            return false;
        }
    }

    /**
     * Parse an IRI into scheme/authority/path/query/fragment segments
     *
     * @param string $iri
     * @return array
     */
    protected function parse_iri($iri)
    {
        $iri = trim($iri, &quot;\x20\x09\x0A\x0C\x0D&quot;);
        if (preg_match(&#039;/^((?P&lt;scheme&gt;[^:\/?#]+):)?(\/\/(?P&lt;authority&gt;[^\/?#]*))?(?P&lt;path&gt;[^?#]*)(\?(?P&lt;query&gt;[^#]*))?(#(?P&lt;fragment&gt;.*))?$/&#039;, $iri, $match)) {
            if ($match[1] === &#039;&#039;) {
                $match[&#039;scheme&#039;] = null;
            }
            if (!isset($match[3]) || $match[3] === &#039;&#039;) {
                $match[&#039;authority&#039;] = null;
            }
            if (!isset($match[5])) {
                $match[&#039;path&#039;] = &#039;&#039;;
            }
            if (!isset($match[6]) || $match[6] === &#039;&#039;) {
                $match[&#039;query&#039;] = null;
            }
            if (!isset($match[8]) || $match[8] === &#039;&#039;) {
                $match[&#039;fragment&#039;] = null;
            }
            return $match;
        }

        // This can occur when a paragraph is accidentally parsed as a URI
        return false;
    }

    /**
     * Remove dot segments from a path
     *
     * @param string $input
     * @return string
     */
    protected function remove_dot_segments($input)
    {
        $output = &#039;&#039;;
        while (strpos($input, &#039;./&#039;) !== false || strpos($input, &#039;/.&#039;) !== false || $input === &#039;.&#039; || $input === &#039;..&#039;) {
            // A: If the input buffer begins with a prefix of &quot;../&quot; or &quot;./&quot;, then remove that prefix from the input buffer; otherwise,
            if (strpos($input, &#039;../&#039;) === 0) {
                $input = substr($input, 3);
            } elseif (strpos($input, &#039;./&#039;) === 0) {
                $input = substr($input, 2);
            }
            // B: if the input buffer begins with a prefix of &quot;/./&quot; or &quot;/.&quot;, where &quot;.&quot; is a complete path segment, then replace that prefix with &quot;/&quot; in the input buffer; otherwise,
            elseif (strpos($input, &#039;/./&#039;) === 0) {
                $input = substr($input, 2);
            } elseif ($input === &#039;/.&#039;) {
                $input = &#039;/&#039;;
            }
            // C: if the input buffer begins with a prefix of &quot;/../&quot; or &quot;/..&quot;, where &quot;..&quot; is a complete path segment, then replace that prefix with &quot;/&quot; in the input buffer and remove the last segment and its preceding &quot;/&quot; (if any) from the output buffer; otherwise,
            elseif (strpos($input, &#039;/../&#039;) === 0) {
                $input = substr($input, 3);
                $output = substr_replace($output, &#039;&#039;, intval(strrpos($output, &#039;/&#039;)));
            } elseif ($input === &#039;/..&#039;) {
                $input = &#039;/&#039;;
                $output = substr_replace($output, &#039;&#039;, intval(strrpos($output, &#039;/&#039;)));
            }
            // D: if the input buffer consists only of &quot;.&quot; or &quot;..&quot;, then remove that from the input buffer; otherwise,
            elseif ($input === &#039;.&#039; || $input === &#039;..&#039;) {
                $input = &#039;&#039;;
            }
            // E: move the first path segment in the input buffer to the end of the output buffer, including the initial &quot;/&quot; character (if any) and any subsequent characters up to, but not including, the next &quot;/&quot; character or the end of the input buffer
            elseif (($pos = strpos($input, &#039;/&#039;, 1)) !== false) {
                $output .= substr($input, 0, $pos);
                $input = substr_replace($input, &#039;&#039;, 0, $pos);
            } else {
                $output .= $input;
                $input = &#039;&#039;;
            }
        }
        return $output . $input;
    }

    /**
     * Replace invalid character with percent encoding
     *
     * @param string $string Input string
     * @param string $extra_chars Valid characters not in iunreserved or
     *                            iprivate (this is ASCII-only)
     * @param bool $iprivate Allow iprivate
     * @return string
     */
    protected function replace_invalid_with_pct_encoding($string, $extra_chars, $iprivate = false)
    {
        // Normalize as many pct-encoded sections as possible
        $string = preg_replace_callback(&#039;/(?:%[A-Fa-f0-9]{2})+/&#039;, [$this, &#039;remove_iunreserved_percent_encoded&#039;], $string);

        // Replace invalid percent characters
        $string = preg_replace(&#039;/%(?![A-Fa-f0-9]{2})/&#039;, &#039;%25&#039;, $string);

        // Add unreserved and % to $extra_chars (the latter is safe because all
        // pct-encoded sections are now valid).
        $extra_chars .= &#039;ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-._~%&#039;;

        // Now replace any bytes that aren&#039;t allowed with their pct-encoded versions
        $position = 0;
        $strlen = strlen($string);
        while (($position += strspn($string, $extra_chars, $position)) &lt; $strlen) {
            $value = ord($string[$position]);
            $character = 0;

            // Start position
            $start = $position;

            // By default we are valid
            $valid = true;

            // No one byte sequences are valid due to the while.
            // Two byte sequence:
            if (($value &amp; 0xE0) === 0xC0) {
                $character = ($value &amp; 0x1F) &lt;&lt; 6;
                $length = 2;
                $remaining = 1;
            }
            // Three byte sequence:
            elseif (($value &amp; 0xF0) === 0xE0) {
                $character = ($value &amp; 0x0F) &lt;&lt; 12;
                $length = 3;
                $remaining = 2;
            }
            // Four byte sequence:
            elseif (($value &amp; 0xF8) === 0xF0) {
                $character = ($value &amp; 0x07) &lt;&lt; 18;
                $length = 4;
                $remaining = 3;
            }
            // Invalid byte:
            else {
                $valid = false;
                $length = 1;
                $remaining = 0;
            }

            if ($remaining) {
                if ($position + $length &lt;= $strlen) {
                    for ($position++; $remaining; $position++) {
                        $value = ord($string[$position]);

                        // Check that the byte is valid, then add it to the character:
                        if (($value &amp; 0xC0) === 0x80) {
                            $character |= ($value &amp; 0x3F) &lt;&lt; (--$remaining * 6);
                        }
                        // If it is invalid, count the sequence as invalid and reprocess the current byte:
                        else {
                            $valid = false;
                            $position--;
                            break;
                        }
                    }
                } else {
                    $position = $strlen - 1;
                    $valid = false;
                }
            }

            // Percent encode anything invalid or not in ucschar
            if (
                // Invalid sequences
                !$valid
                // Non-shortest form sequences are invalid
                || $length &gt; 1 &amp;&amp; $character &lt;= 0x7F
                || $length &gt; 2 &amp;&amp; $character &lt;= 0x7FF
                || $length &gt; 3 &amp;&amp; $character &lt;= 0xFFFF
                // Outside of range of ucschar codepoints
                // Noncharacters
                || ($character &amp; 0xFFFE) === 0xFFFE
                || $character &gt;= 0xFDD0 &amp;&amp; $character &lt;= 0xFDEF
                || (
                    // Everything else not in ucschar
                    $character &gt; 0xD7FF &amp;&amp; $character &lt; 0xF900
                    || $character &lt; 0xA0
                    || $character &gt; 0xEFFFD
                )
                &amp;&amp; (
                    // Everything not in iprivate, if it applies
                    !$iprivate
                    || $character &lt; 0xE000
                    || $character &gt; 0x10FFFD
                )
            ) {
                // If we were a character, pretend we weren&#039;t, but rather an error.
                if ($valid) {
                    $position--;
                }

                for ($j = $start; $j &lt;= $position; $j++) {
                    $string = substr_replace($string, sprintf(&#039;%%%02X&#039;, ord($string[$j])), $j, 1);
                    $j += 2;
                    $position += 2;
                    $strlen += 2;
                }
            }
        }

        return $string;
    }

    /**
     * Callback function for preg_replace_callback.
     *
     * Removes sequences of percent encoded bytes that represent UTF-8
     * encoded characters in iunreserved
     *
     * @param array $match PCRE match
     * @return string Replacement
     */
    protected function remove_iunreserved_percent_encoded($match)
    {
        // As we just have valid percent encoded sequences we can just explode
        // and ignore the first member of the returned array (an empty string).
        $bytes = explode(&#039;%&#039;, $match[0]);

        // Initialize the new string (this is what will be returned) and that
        // there are no bytes remaining in the current sequence (unsurprising
        // at the first byte!).
        $string = &#039;&#039;;
        $remaining = 0;

        // these variables will be initialized in the loop but PHPStan is not able to detect it currently
        $start = 0;
        $character = 0;
        $length = 0;
        $valid = true;

        // Loop over each and every byte, and set $value to its value
        for ($i = 1, $len = count($bytes); $i &lt; $len; $i++) {
            $value = hexdec($bytes[$i]);

            // If we&#039;re the first byte of sequence:
            if (!$remaining) {
                // Start position
                $start = $i;

                // By default we are valid
                $valid = true;

                // One byte sequence:
                if ($value &lt;= 0x7F) {
                    $character = $value;
                    $length = 1;
                }
                // Two byte sequence:
                elseif (($value &amp; 0xE0) === 0xC0) {
                    $character = ($value &amp; 0x1F) &lt;&lt; 6;
                    $length = 2;
                    $remaining = 1;
                }
                // Three byte sequence:
                elseif (($value &amp; 0xF0) === 0xE0) {
                    $character = ($value &amp; 0x0F) &lt;&lt; 12;
                    $length = 3;
                    $remaining = 2;
                }
                // Four byte sequence:
                elseif (($value &amp; 0xF8) === 0xF0) {
                    $character = ($value &amp; 0x07) &lt;&lt; 18;
                    $length = 4;
                    $remaining = 3;
                }
                // Invalid byte:
                else {
                    $valid = false;
                    $remaining = 0;
                }
            }
            // Continuation byte:
            else {
                // Check that the byte is valid, then add it to the character:
                if (($value &amp; 0xC0) === 0x80) {
                    $remaining--;
                    $character |= ($value &amp; 0x3F) &lt;&lt; ($remaining * 6);
                }
                // If it is invalid, count the sequence as invalid and reprocess the current byte as the start of a sequence:
                else {
                    $valid = false;
                    $remaining = 0;
                    $i--;
                }
            }

            // If we&#039;ve reached the end of the current byte sequence, append it to Unicode::$data
            if (!$remaining) {
                // Percent encode anything invalid or not in iunreserved
                if (
                    // Invalid sequences
                    !$valid
                    // Non-shortest form sequences are invalid
                    || $length &gt; 1 &amp;&amp; $character &lt;= 0x7F
                    || $length &gt; 2 &amp;&amp; $character &lt;= 0x7FF
                    || $length &gt; 3 &amp;&amp; $character &lt;= 0xFFFF
                    // Outside of range of iunreserved codepoints
                    || $character &lt; 0x2D
                    || $character &gt; 0xEFFFD
                    // Noncharacters
                    || ($character &amp; 0xFFFE) === 0xFFFE
                    || $character &gt;= 0xFDD0 &amp;&amp; $character &lt;= 0xFDEF
                    // Everything else not in iunreserved (this is all BMP)
                    || $character === 0x2F
                    || $character &gt; 0x39 &amp;&amp; $character &lt; 0x41
                    || $character &gt; 0x5A &amp;&amp; $character &lt; 0x61
                    || $character &gt; 0x7A &amp;&amp; $character &lt; 0x7E
                    || $character &gt; 0x7E &amp;&amp; $character &lt; 0xA0
                    || $character &gt; 0xD7FF &amp;&amp; $character &lt; 0xF900
                ) {
                    for ($j = $start; $j &lt;= $i; $j++) {
                        $string .= &#039;%&#039; . strtoupper($bytes[$j]);
                    }
                } else {
                    for ($j = $start; $j &lt;= $i; $j++) {
                        $string .= chr(hexdec($bytes[$j]));
                    }
                }
            }
        }

        // If we have any bytes left over they are invalid (i.e., we are
        // mid-way through a multi-byte sequence)
        if ($remaining) {
            for ($j = $start; $j &lt; $len; $j++) {
                $string .= &#039;%&#039; . strtoupper($bytes[$j]);
            }
        }

        return $string;
    }

    protected function scheme_normalization()
    {
        if (isset($this-&gt;normalization[$this-&gt;scheme][&#039;iuserinfo&#039;]) &amp;&amp; $this-&gt;iuserinfo === $this-&gt;normalization[$this-&gt;scheme][&#039;iuserinfo&#039;]) {
            $this-&gt;iuserinfo = null;
        }
        if (isset($this-&gt;normalization[$this-&gt;scheme][&#039;ihost&#039;]) &amp;&amp; $this-&gt;ihost === $this-&gt;normalization[$this-&gt;scheme][&#039;ihost&#039;]) {
            $this-&gt;ihost = null;
        }
        if (isset($this-&gt;normalization[$this-&gt;scheme][&#039;port&#039;]) &amp;&amp; $this-&gt;port === $this-&gt;normalization[$this-&gt;scheme][&#039;port&#039;]) {
            $this-&gt;port = null;
        }
        if (isset($this-&gt;normalization[$this-&gt;scheme][&#039;ipath&#039;]) &amp;&amp; $this-&gt;ipath === $this-&gt;normalization[$this-&gt;scheme][&#039;ipath&#039;]) {
            $this-&gt;ipath = &#039;&#039;;
        }
        if (isset($this-&gt;normalization[$this-&gt;scheme][&#039;iquery&#039;]) &amp;&amp; $this-&gt;iquery === $this-&gt;normalization[$this-&gt;scheme][&#039;iquery&#039;]) {
            $this-&gt;iquery = null;
        }
        if (isset($this-&gt;normalization[$this-&gt;scheme][&#039;ifragment&#039;]) &amp;&amp; $this-&gt;ifragment === $this-&gt;normalization[$this-&gt;scheme][&#039;ifragment&#039;]) {
            $this-&gt;ifragment = null;
        }
    }

    /**
     * Check if the object represents a valid IRI. This needs to be done on each
     * call as some things change depending on another part of the IRI.
     *
     * @return bool
     */
    public function is_valid()
    {
        if ($this-&gt;ipath === &#039;&#039;) {
            return true;
        }

        $isauthority = $this-&gt;iuserinfo !== null || $this-&gt;ihost !== null ||
            $this-&gt;port !== null;
        if ($isauthority &amp;&amp; $this-&gt;ipath[0] === &#039;/&#039;) {
            return true;
        }

        if (!$isauthority &amp;&amp; (substr($this-&gt;ipath, 0, 2) === &#039;//&#039;)) {
            return false;
        }

        // Relative urls cannot have a colon in the first path segment (and the
        // slashes themselves are not included so skip the first character).
        if (!$this-&gt;scheme &amp;&amp; !$isauthority &amp;&amp;
            strpos($this-&gt;ipath, &#039;:&#039;) !== false &amp;&amp;
            strpos($this-&gt;ipath, &#039;/&#039;, 1) !== false &amp;&amp;
            strpos($this-&gt;ipath, &#039;:&#039;) &lt; strpos($this-&gt;ipath, &#039;/&#039;, 1)) {
            return false;
        }

        return true;
    }

    /**
     * Set the entire IRI. Returns true on success, false on failure (if there
     * are any invalid characters).
     *
     * @param string $iri
     * @return bool
     */
    public function set_iri($iri, $clear_cache = false)
    {
        static $cache;
        if ($clear_cache) {
            $cache = null;
            return;
        }
        if (!$cache) {
            $cache = [];
        }

        if ($iri === null) {
            return true;
        } elseif (isset($cache[$iri])) {
            [
                $this-&gt;scheme,
                $this-&gt;iuserinfo,
                $this-&gt;ihost,
                $this-&gt;port,
                $this-&gt;ipath,
                $this-&gt;iquery,
                $this-&gt;ifragment,
                $return
            ] = $cache[$iri];

            return $return;
        }

        $parsed = $this-&gt;parse_iri((string) $iri);
        if (!$parsed) {
            return false;
        }

        $return = $this-&gt;set_scheme($parsed[&#039;scheme&#039;])
            &amp;&amp; $this-&gt;set_authority($parsed[&#039;authority&#039;])
            &amp;&amp; $this-&gt;set_path($parsed[&#039;path&#039;])
            &amp;&amp; $this-&gt;set_query($parsed[&#039;query&#039;])
            &amp;&amp; $this-&gt;set_fragment($parsed[&#039;fragment&#039;]);

        $cache[$iri] = [
            $this-&gt;scheme,
            $this-&gt;iuserinfo,
            $this-&gt;ihost,
            $this-&gt;port,
            $this-&gt;ipath,
            $this-&gt;iquery,
            $this-&gt;ifragment,
            $return
        ];

        return $return;
    }

    /**
     * Set the scheme. Returns true on success, false on failure (if there are
     * any invalid characters).
     *
     * @param string $scheme
     * @return bool
     */
    public function set_scheme($scheme)
    {
        if ($scheme === null) {
            $this-&gt;scheme = null;
        } elseif (!preg_match(&#039;/^[A-Za-z][0-9A-Za-z+\-.]*$/&#039;, $scheme)) {
            $this-&gt;scheme = null;
            return false;
        } else {
            $this-&gt;scheme = strtolower($scheme);
        }
        return true;
    }

    /**
     * Set the authority. Returns true on success, false on failure (if there are
     * any invalid characters).
     *
     * @param string $authority
     * @return bool
     */
    public function set_authority($authority, $clear_cache = false)
    {
        static $cache;
        if ($clear_cache) {
            $cache = null;
            return;
        }
        if (!$cache) {
            $cache = [];
        }

        if ($authority === null) {
            $this-&gt;iuserinfo = null;
            $this-&gt;ihost = null;
            $this-&gt;port = null;
            return true;
        } elseif (isset($cache[$authority])) {
            [
                $this-&gt;iuserinfo,
                $this-&gt;ihost,
                $this-&gt;port,
                $return
            ] = $cache[$authority];

            return $return;
        }

        $remaining = $authority;
        if (($iuserinfo_end = strrpos($remaining, &#039;@&#039;)) !== false) {
            $iuserinfo = substr($remaining, 0, $iuserinfo_end);
            $remaining = substr($remaining, $iuserinfo_end + 1);
        } else {
            $iuserinfo = null;
        }
        if (($port_start = strpos($remaining, &#039;:&#039;, intval(strpos($remaining, &#039;]&#039;)))) !== false) {
            if (($port = substr($remaining, $port_start + 1)) === false) {
                $port = null;
            }
            $remaining = substr($remaining, 0, $port_start);
        } else {
            $port = null;
        }

        $return = $this-&gt;set_userinfo($iuserinfo) &amp;&amp;
                  $this-&gt;set_host($remaining) &amp;&amp;
                  $this-&gt;set_port($port);

        $cache[$authority] = [
            $this-&gt;iuserinfo,
            $this-&gt;ihost,
            $this-&gt;port,
            $return
        ];

        return $return;
    }

    /**
     * Set the iuserinfo.
     *
     * @param string $iuserinfo
     * @return bool
     */
    public function set_userinfo($iuserinfo)
    {
        if ($iuserinfo === null) {
            $this-&gt;iuserinfo = null;
        } else {
            $this-&gt;iuserinfo = $this-&gt;replace_invalid_with_pct_encoding($iuserinfo, &#039;!$&amp;\&#039;()*+,;=:&#039;);
            $this-&gt;scheme_normalization();
        }

        return true;
    }

    /**
     * Set the ihost. Returns true on success, false on failure (if there are
     * any invalid characters).
     *
     * @param string $ihost
     * @return bool
     */
    public function set_host($ihost)
    {
        if ($ihost === null) {
            $this-&gt;ihost = null;
            return true;
        } elseif (substr($ihost, 0, 1) === &#039;[&#039; &amp;&amp; substr($ihost, -1) === &#039;]&#039;) {
            if (\SimplePie\Net\IPv6::check_ipv6(substr($ihost, 1, -1))) {
                $this-&gt;ihost = &#039;[&#039; . \SimplePie\Net\IPv6::compress(substr($ihost, 1, -1)) . &#039;]&#039;;
            } else {
                $this-&gt;ihost = null;
                return false;
            }
        } else {
            $ihost = $this-&gt;replace_invalid_with_pct_encoding($ihost, &#039;!$&amp;\&#039;()*+,;=&#039;);

            // Lowercase, but ignore pct-encoded sections (as they should
            // remain uppercase). This must be done after the previous step
            // as that can add unescaped characters.
            $position = 0;
            $strlen = strlen($ihost);
            while (($position += strcspn($ihost, &#039;ABCDEFGHIJKLMNOPQRSTUVWXYZ%&#039;, $position)) &lt; $strlen) {
                if ($ihost[$position] === &#039;%&#039;) {
                    $position += 3;
                } else {
                    $ihost[$position] = strtolower($ihost[$position]);
                    $position++;
                }
            }

            $this-&gt;ihost = $ihost;
        }

        $this-&gt;scheme_normalization();

        return true;
    }

    /**
     * Set the port. Returns true on success, false on failure (if there are
     * any invalid characters).
     *
     * @param string $port
     * @return bool
     */
    public function set_port($port)
    {
        if ($port === null) {
            $this-&gt;port = null;
            return true;
        } elseif (strspn($port, &#039;0123456789&#039;) === strlen($port)) {
            $this-&gt;port = (int) $port;
            $this-&gt;scheme_normalization();
            return true;
        }

        $this-&gt;port = null;
        return false;
    }

    /**
     * Set the ipath.
     *
     * @param string $ipath
     * @return bool
     */
    public function set_path($ipath, $clear_cache = false)
    {
        static $cache;
        if ($clear_cache) {
            $cache = null;
            return;
        }
        if (!$cache) {
            $cache = [];
        }

        $ipath = (string) $ipath;

        if (isset($cache[$ipath])) {
            $this-&gt;ipath = $cache[$ipath][(int) ($this-&gt;scheme !== null)];
        } else {
            $valid = $this-&gt;replace_invalid_with_pct_encoding($ipath, &#039;!$&amp;\&#039;()*+,;=@:/&#039;);
            $removed = $this-&gt;remove_dot_segments($valid);

            $cache[$ipath] = [$valid, $removed];
            $this-&gt;ipath =  ($this-&gt;scheme !== null) ? $removed : $valid;
        }

        $this-&gt;scheme_normalization();
        return true;
    }

    /**
     * Set the iquery.
     *
     * @param string $iquery
     * @return bool
     */
    public function set_query($iquery)
    {
        if ($iquery === null) {
            $this-&gt;iquery = null;
        } else {
            $this-&gt;iquery = $this-&gt;replace_invalid_with_pct_encoding($iquery, &#039;!$&amp;\&#039;()*+,;=:@/?&#039;, true);
            $this-&gt;scheme_normalization();
        }
        return true;
    }

    /**
     * Set the ifragment.
     *
     * @param string $ifragment
     * @return bool
     */
    public function set_fragment($ifragment)
    {
        if ($ifragment === null) {
            $this-&gt;ifragment = null;
        } else {
            $this-&gt;ifragment = $this-&gt;replace_invalid_with_pct_encoding($ifragment, &#039;!$&amp;\&#039;()*+,;=:@/?&#039;);
            $this-&gt;scheme_normalization();
        }
        return true;
    }

    /**
     * Convert an IRI to a URI (or parts thereof)
     *
     * @return string
     */
    public function to_uri($string)
    {
        static $non_ascii;
        if (!$non_ascii) {
            $non_ascii = implode(&#039;&#039;, range(&quot;\x80&quot;, &quot;\xFF&quot;));
        }

        $position = 0;
        $strlen = strlen($string);
        while (($position += strcspn($string, $non_ascii, $position)) &lt; $strlen) {
            $string = substr_replace($string, sprintf(&#039;%%%02X&#039;, ord($string[$position])), $position, 1);
            $position += 3;
            $strlen += 2;
        }

        return $string;
    }

    /**
     * Get the complete IRI
     *
     * @return string
     */
    public function get_iri()
    {
        if (!$this-&gt;is_valid()) {
            return false;
        }

        $iri = &#039;&#039;;
        if ($this-&gt;scheme !== null) {
            $iri .= $this-&gt;scheme . &#039;:&#039;;
        }
        if (($iauthority = $this-&gt;get_iauthority()) !== null) {
            $iri .= &#039;//&#039; . $iauthority;
        }
        if ($this-&gt;ipath !== &#039;&#039;) {
            $iri .= $this-&gt;ipath;
        } elseif (!empty($this-&gt;normalization[$this-&gt;scheme][&#039;ipath&#039;]) &amp;&amp; $iauthority !== null &amp;&amp; $iauthority !== &#039;&#039;) {
            $iri .= $this-&gt;normalization[$this-&gt;scheme][&#039;ipath&#039;];
        }
        if ($this-&gt;iquery !== null) {
            $iri .= &#039;?&#039; . $this-&gt;iquery;
        }
        if ($this-&gt;ifragment !== null) {
            $iri .= &#039;#&#039; . $this-&gt;ifragment;
        }

        return $iri;
    }

    /**
     * Get the complete URI
     *
     * @return string
     */
    public function get_uri()
    {
        return $this-&gt;to_uri($this-&gt;get_iri());
    }

    /**
     * Get the complete iauthority
     *
     * @return string
     */
    protected function get_iauthority()
    {
        if ($this-&gt;iuserinfo !== null || $this-&gt;ihost !== null || $this-&gt;port !== null) {
            $iauthority = &#039;&#039;;
            if ($this-&gt;iuserinfo !== null) {
                $iauthority .= $this-&gt;iuserinfo . &#039;@&#039;;
            }
            if ($this-&gt;ihost !== null) {
                $iauthority .= $this-&gt;ihost;
            }
            if ($this-&gt;port !== null &amp;&amp; $this-&gt;port !== 0) {
                $iauthority .= &#039;:&#039; . $this-&gt;port;
            }
            return $iauthority;
        }

        return null;
    }

    /**
     * Get the complete authority
     *
     * @return string
     */
    protected function get_authority()
    {
        $iauthority = $this-&gt;get_iauthority();
        if (is_string($iauthority)) {
            return $this-&gt;to_uri($iauthority);
        }

        return $iauthority;
    }
}

class_alias(&#039;SimplePie\IRI&#039;, &#039;SimplePie_IRI&#039;);
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