<?php
function hex($str='',$code='') {
if(($code>=0)and($code<100)) {
$t .=dechex(strlen($str)+$code)."g";
$str=strrev($str);
for($i=0;$i<=strlen($str)-1;$i++) {
$t .=dechex(ord(substr($str,$i,1))+$code);
}
}
return $t;
}
function unhex($str='',$code='') {
$all=explode("g",$str);
$head=hexdec($all[0])-$code;
$content=$all[1];
if($head==(strlen($content)/2)) {
for($i=0;$i<=$head-1;$i++) {
$t .=chr(hexdec(substr($content,$i*2,2))-$code);
}
$t =strrev($t);
}
return $t;
}
?>