<?php
	function cb($a){
        $num = $a[1];
        $dec = hexdec($num);
        return "&#$dec;";
}
$ent = preg_replace_callback("/\\\\x\{([\da-z]+)\}/i", 'cb', "\x{2f}, \x{3251}");
$ustr = html_entity_decode($ent, ENT_NOQUOTES, 'UTF-8');
echo $ustr;

?>