php端模拟js的escape()和unescape()函数

[php]代码库

//UTF-8 js escape实现
function escape($str) {
    preg_match_all("/[\xc2-\xdf][\x80-\xbf]+|[\xe0-\xef][\x80-\xbf]{2}|[\xf0-\xff][\x80-\xbf]{3}|[\x01-\x7f]+/e",$str,$r);
    $str = $r[0];
    $l = count($str);
    for($i=0; $i <$l; $i++) {
        $value = ord($str[$i][0]);
        if($value < 223) {
            $str[$i] = rawurlencode(utf8_decode($str[$i]));
        }
        else {
            $str[$i] = "%u".strtoupper(bin2hex(iconv("UTF-8","UCS-2",$str[$i])));
        }
    }
    return join("",$str);
}
//UTF-8 js unescape实现
function js_unescape($str) {
    $ret = '';
    $len = strlen($str);
    for ($i = 0; $i < $len; $i++) {
        if ($str[$i] == '%' && $str[$i+1] == 'u') {
            $val = hexdec(substr($str, $i+2, 4));
            if ($val < 0x7f) $ret .= chr($val);
            else if($val < 0x800) $ret .= chr(0xc0|($val>>6)).chr(0x80|($val&0x3f));
            else $ret .= chr(0xe0|($val>>12)).chr(0x80|(($val>>6)&0x3f)).chr(0x80|($val&0x3f));
            $i += 5;
        }
        else if ($str[$i] == '%') {
            $ret .= urldecode(substr($str, $i, 3));
            $i += 2;
        }
        else $ret .= $str[$i];
    }
    return $ret;
}