加解密

<?php

echo decode('Mxjlkh2gOTMO0O0O');

function decode($string = '',$skey='xlhg') {

$strArr = str_split(str_replace(array('O0O0O', 'o000o', 'oo00o'), array('=', '+', '/'), $string), 2);

$strCount = count($strArr);

foreach (str_split($skey) as $key => $value)

$key <= $strCount && isset($strArr[$key]) && $strArr[$key][1] === $value && $strArr[$key] = $strArr[$key][0];

return base64_decode(join('', $strArr));

}