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<?php
/**
* @version $Id$
* @package utf8
* @subpackage strings
*/

//---------------------------------------------------------------
/**
* UTF-8 aware replacement for ltrim()
* Note: you only need to use this if you are supplying the charlist
* optional arg and it contains UTF-8 characters. Otherwise ltrim will
* work normally on a UTF-8 string
* @author Andreas Gohr <andi@splitbrain.org>
* @see http://www.php.net/ltrim
* @see http://dev.splitbrain.org/view/darcs/dokuwiki/inc/utf8.php
* @return string
* @package utf8
* @subpackage strings
*/
function utf8_ltrim( $str, $charlist = FALSE ) {
    if($charlist === FALSE) return ltrim($str);

    //quote charlist for use in a characterclass
    $charlist = preg_replace('!([\\\\\\-\\]\\[/^])!','\\\${1}',$charlist);

    return preg_replace('/^['.$charlist.']+/u','',$str);
}

//---------------------------------------------------------------
/**
* UTF-8 aware replacement for rtrim()
* Note: you only need to use this if you are supplying the charlist
* optional arg and it contains UTF-8 characters. Otherwise rtrim will
* work normally on a UTF-8 string
* @author Andreas Gohr <andi@splitbrain.org>
* @see http://www.php.net/rtrim
* @see http://dev.splitbrain.org/view/darcs/dokuwiki/inc/utf8.php
* @return string
* @package utf8
* @subpackage strings
*/
function utf8_rtrim( $str, $charlist = FALSE ) {
    if($charlist === FALSE) return rtrim($str);

    //quote charlist for use in a characterclass
    $charlist = preg_replace('!([\\\\\\-\\]\\[/^])!','\\\${1}',$charlist);

    return preg_replace('/['.$charlist.']+$/u','',$str);
}

//---------------------------------------------------------------
/**
* UTF-8 aware replacement for trim()
* Note: you only need to use this if you are supplying the charlist
* optional arg and it contains UTF-8 characters. Otherwise trim will
* work normally on a UTF-8 string
* @author Andreas Gohr <andi@splitbrain.org>
* @see http://www.php.net/trim
* @see http://dev.splitbrain.org/view/darcs/dokuwiki/inc/utf8.php
* @return string
* @package utf8
* @subpackage strings
*/
function utf8_trim( $str, $charlist = FALSE ) {
    if($charlist === FALSE) return trim($str);
    return utf8_ltrim(utf8_rtrim($str, $charlist), $charlist);
}