mcrypt 256 bit

<?php
// Encrypt
function mc_encrypt($t, $k) {
    $i = mcrypt_create_iv(mcrypt_get_iv_size(MCRYPT_RIJNDAEL_256, MCRYPT_MODE_ECB), MCRYPT_RAND);
    $p = trim(mcrypt_encrypt(MCRYPT_RIJNDAEL_256, $k, trim($t), MCRYPT_MODE_ECB, $i));
    $s = base64_encode($p);
    return $s;
}

// Decrypt
function mc_decrypt($t, $k) {
    $d = base64_decode($t);
    $i = mcrypt_create_iv(mcrypt_get_iv_size(MCRYPT_RIJNDAEL_256, MCRYPT_MODE_ECB), MCRYPT_RAND);
    $s = trim(mcrypt_decrypt(MCRYPT_RIJNDAEL_256, $k, trim($d), MCRYPT_MODE_ECB, $i));
    return $s;
}
?>