escape编码 和 unescape解码

function escape($str) {
	$sublen = strlen ( $str );
	$retrunString = "";
	for($i = 0; $i < $sublen; $i ++) {
		if (ord ( $str [$i] ) >= 127) {
			$tmpString = bin2hex ( iconv ( "gb2312", "ucs-2", substr ( $str, $i, 2 ) ) );
			$retrunString .= "%u" . $tmpString;
			$i ++;
		} else {
			$retrunString .= "%" . dechex ( ord ( $str [$i] ) );
		}
	}
	return $retrunString;
}
function unescape($str) {
	$str = rawurldecode ( $str );
	preg_match_all ( "/%u.{4}|&#x.{4};|&#\d+;|.+/U", $str, $r );
	$ar = $r [0];
	foreach ( $ar as $k => $v ) {
		if (substr ( $v, 0, 2 ) == "%u")
			$ar [$k] = iconv ( "UCS-2", "GBK", pack ( "H4", substr ( $v, - 4 ) ) );
		elseif (substr ( $v, 0, 3 ) == "&#x")
			$ar [$k] = iconv ( "UCS-2", "GBK", pack ( "H4", substr ( $v, 3, - 1 ) ) );
		elseif (substr ( $v, 0, 2 ) == "&#") {
			$ar [$k] = iconv ( "UCS-2", "GBK", pack ( "n", substr ( $v, 2, - 1 ) ) );
		}
	}
	return join ( "", $ar );
}