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<?php
/**
* @package utf8
*/

//---------------------------------------------------------------
/**
* UTF-8 aware alternative to str_split
* Convert a string to an array
* Note: requires utf8_strlen to be loaded
* @param string UTF-8 encoded
* @param int number to characters to split string by
* @return string characters in string reverses
* @see http://www.php.net/str_split
* @see utf8_strlen
* @package utf8
*/
function utf8_str_split($str, $split_len = 1) {

    if ( !preg_match('/^[0-9]+$/',$split_len) || $split_len < 1 ) {
        return FALSE;
    }

    $len = utf8_strlen($str);
    if ( $len <= $split_len ) {
        return array($str);
    }

    preg_match_all('/.{'.$split_len.'}|[^\x00]{1,'.$split_len.'}$/us', $str, $ar);
    return $ar[0];

}