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<?php
/**
 * transcode wrapper functions
 * @package IDNA Convert
 * @subpackage charset transcoding
 * @author Matthias Sommerfeld, <mso@phlylabs.de>
 * @version 0.1.0
 */

/**
 * Convert a string from any of various encodings to UTF-8
 *
 * @param  string  String to encode
 *[@param  string  Encoding; Default: ISO-8859-1]
 *[@param  bool  Safe Mode: if set to TRUE, the original string is retunred on errors]
 * @return  string  The encoded string or false on failure
 * @since 0.0.1
 */
function encode_utf8( $string = '', $encoding = 'iso-8859-1', $safe_mode = false ) {
	$safe = ( $safe_mode ) ? $string : false;
	if ( strtoupper( $encoding ) == 'UTF-8' || strtoupper( $encoding ) == 'UTF8' ) {
		return $string;
	} elseif ( strtoupper( $encoding ) == 'ISO-8859-1' ) {
		return utf8_encode( $string );
	} elseif ( strtoupper( $encoding ) == 'WINDOWS-1252' ) {
		return utf8_encode( map_w1252_iso8859_1( $string ) );
	} elseif ( strtoupper( $encoding ) == 'UNICODE-1-1-UTF-7' ) {
		$encoding = 'utf-7';
	}
	if ( function_exists( 'mb_convert_encoding' ) ) {
		$conv = @mb_convert_encoding( $string, 'UTF-8', strtoupper( $encoding ) );
		if ( $conv ) {
			return $conv;
		}
	}
	if ( function_exists( 'iconv' ) ) {
		$conv = @iconv( strtoupper( $encoding ), 'UTF-8', $string );
		if ( $conv ) {
			return $conv;
		}
	}
	if ( function_exists( 'libiconv' ) ) {
		$conv = @libiconv( strtoupper( $encoding ), 'UTF-8', $string );
		if ( $conv ) {
			return $conv;
		}
	}
	return $safe;
}

/**
 * Convert a string from UTF-8 to any of various encodings
 *
 * @param  string  String to decode
 *[@param  string  Encoding; Default: ISO-8859-1]
 *[@param  bool  Safe Mode: if set to TRUE, the original string is retunred on errors]
 * @return  string  The decoded string or false on failure
 * @since 0.0.1
 */
function decode_utf8( $string = '', $encoding = 'iso-8859-1', $safe_mode = false ) {
	$safe = ( $safe_mode ) ? $string : false;
	if ( ! $encoding ) {
		$encoding = 'ISO-8859-1';
	}
	if ( strtoupper( $encoding ) == 'UTF-8' || strtoupper( $encoding ) == 'UTF8' ) {
		return $string;
	} elseif ( strtoupper( $encoding ) == 'ISO-8859-1' ) {
		return utf8_decode( $string );
	} elseif ( strtoupper( $encoding ) == 'WINDOWS-1252' ) {
		return map_iso8859_1_w1252( utf8_decode( $string ) );
	} elseif ( strtoupper( $encoding ) == 'UNICODE-1-1-UTF-7' ) {
		$encoding = 'utf-7';
	}
	if ( function_exists( 'mb_convert_encoding' ) ) {
		$conv = @mb_convert_encoding( $string, strtoupper( $encoding ), 'UTF-8' );
		if ( $conv ) {
			return $conv;
		}
	}
	if ( function_exists( 'iconv' ) ) {
		$conv = @iconv( 'UTF-8', strtoupper( $encoding ), $string );
		if ( $conv ) {
			return $conv;
		}
	}
	if ( function_exists( 'libiconv' ) ) {
		$conv = @libiconv( 'UTF-8', strtoupper( $encoding ), $string );
		if ( $conv ) {
			return $conv;
		}
	}
	return $safe;
}

/**
 * Special treatment for our guys in Redmond
 * Windows-1252 is basically ISO-8859-1 -- with some exceptions, which get accounted for here
 * @param  string  Your input in Win1252
 * @param  string  The resulting ISO-8859-1 string
 * @since 3.0.8
 */
function map_w1252_iso8859_1( $string = '' ) {
	if ( '' == $string ) {
		return '';
	}
	$return = '';
	for ( $i = 0; $i < strlen( $string ); ++$i ) {
		$c = ord( $string[ $i ] );
		switch ( $c ) {
			case 129:
				$return .= chr( 252 );
				break;
			case 132:
				$return .= chr( 228 );
				break;
			case 142:
				$return .= chr( 196 );
				break;
			case 148:
				$return .= chr( 246 );
				break;
			case 153:
				$return .= chr( 214 );
				break;
			case 154:
				$return .= chr( 220 );
				break;
			case 225:
				$return .= chr( 223 );
				break;
			default:
				$return .= chr( $c );
				break;
		}
	}
	return $return;
}

/**
 * Special treatment for our guys in Redmond
 * Windows-1252 is basically ISO-8859-1 -- with some exceptions, which get accounted for here
 * @param  string  Your input in ISO-8859-1
 * @param  string  The resulting Win1252 string
 * @since 3.0.8
 */
function map_iso8859_1_w1252( $string = '' ) {
	if ( '' == $string ) {
		return '';
	}
	$return = '';
	for ( $i = 0; $i < strlen( $string ); ++$i ) {
		$c = ord( $string[ $i ] );
		switch ( $c ) {
			case 196:
				$return .= chr( 142 );
				break;
			case 214:
				$return .= chr( 153 );
				break;
			case 220:
				$return .= chr( 154 );
				break;
			case 223:
				$return .= chr( 225 );
				break;
			case 228:
				$return .= chr( 132 );
				break;
			case 246:
				$return .= chr( 148 );
				break;
			case 252:
				$return .= chr( 129 );
				break;
			default:
				$return .= chr( $c );
				break;
		}
	}
	return $return;
}

Editing: transcode_wrapper.php

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