aes.php

<?php 

function addpadding($string, $blocksize = 16)
{
    $len = strlen($string);
    $pad = $blocksize - ($len % $blocksize);
    $string .= str_repeat(chr($pad), $pad);
    return $string;
}

function strippadding($string)
{
    $slast = ord(substr($string, -1));
    $slastc = chr($slast);
    $pcheck = substr($string, -$slast);
    if(preg_match("/$slastc{".$slast."}/", $string)){
        $string = substr($string, 0, strlen($string)-$slast);
        return $string;
    } else {
        return false;
    }
}

function encrypt($string = "", $key)
{
	return base64_encode(mcrypt_encrypt(MCRYPT_RIJNDAEL_128, $key, addpadding($string), MCRYPT_MODE_ECB));
}

function decrypt($string = "", $key)
{
	$string = base64_decode($string);
	return strippadding(mcrypt_decrypt(MCRYPT_RIJNDAEL_128, $key, $string, MCRYPT_MODE_ECB));
}

?>