Is mcrypt_encrypt() function not working in PHP 7.2? - php

Question

I have encryption code as below & it was working in PHP version 5.6. But it is not working in PHP version 7.2.
**
Warning : Use of undefined constant MCRYPT_RIJNDAEL_128 - assumed
'MCRYPT_RIJNDAEL_128' (this will throw an Error in a future version of
PHP)
**
Any alternative of this?
$serviceid="2951";
$secretkey = "fQ5FHy0qzM6ljp97";
function pkcs5_pad ($text, $blocksize)
{
$pad = $blocksize - (strlen($text) % $blocksize);
return $text . str_repeat(chr($pad), $pad);
}
function encrypt($plaintext, $key) {
$plaintext = pkcs5_pad($plaintext, 16);
$ciphertext = mcrypt_encrypt(MCRYPT_RIJNDAEL_128, $key, $plaintext, MCRYPT_MODE_ECB);
$ciphertext_base64 = base64_encode($ciphertext);
$ciphertext_base64;
}
$data = $serviceid;
$auth= encrypt($data ,$secretkey);
Value of encryption is AGchNk2xOnHHxhgYv02XJw==
I tried with below code in PHP 7.2
function encrypt($plaintext, $key)
{
$iv = openssl_random_pseudo_bytes(openssl_cipher_iv_length('aes-128-cbc'));
$encrypted = openssl_encrypt($plaintext, 'aes-128-cbc', $key, 0, $iv);
return base64_encode($encrypted . '::' . $iv);
}
but output keeps changing

Answer 1

As you can see into documentation mcrypt_encrypt is REMOVED from PHP 7.2.0
Here an SO question for best alternative

Answer 2

I have found solution of my query. Please check below
function encrypt($plaintext,$key)
{
return base64_encode(openssl_encrypt($plaintext, 'aes-128-ecb', $key, OPENSSL_RAW_DATA));
}