Encrypt and Decrypt the data such as credit card detials

Here is the function to encrypt and decrypt the secrured data such as credit card information

<?php
function encrypt($decrypted, $password, $salt='Your Salt Key') {
 $key = hash('SHA256', $salt . $password, true);
 srand();
 $iv = mcrypt_create_iv(mcrypt_get_iv_size(MCRYPT_RIJNDAEL_128, MCRYPT_MODE_CBC), MCRYPT_RAND);
 if (strlen($iv_base64 = rtrim(base64_encode($iv), '=')) != 22) return false;
 $encrypted = base64_encode(mcrypt_encrypt(MCRYPT_RIJNDAEL_128, $key, $decrypted . md5($decrypted), MCRYPT_MODE_CBC, $iv));
 return $iv_base64 . $encrypted;
 }

function decrypt($encrypted, $password, $salt='Your Salt Key') {
 $key = hash('SHA256', $salt . $password, true);
 $iv = base64_decode(substr($encrypted, 0, 22) . '==');
 $encrypted = substr($encrypted, 22);
 $decrypted = rtrim(mcrypt_decrypt(MCRYPT_RIJNDAEL_128, $key, base64_decode($encrypted), MCRYPT_MODE_CBC, $iv), "\0\4");
 $hash = substr($decrypted, -32);
 $decrypted = substr($decrypted, 0, -32);
 if (md5($decrypted) != $hash) return false;
 return $decrypted;
 }

echo encrypt('7645985623564879');echo "<br />";
echo decrypt('2PVPlNvDCD/bVAHt/AdtCAIkvnQVYfjPaMX+tIsrXky3IaNrg0yQf4GF8S66TYHDsMPSQJFdrjYsJQlGrylkVV');
?>