How can developers ensure compatibility between encryption and decryption processes in PHP and Lua when using different libraries like mcrypt and OpenSSL?

To ensure compatibility between encryption and decryption processes in PHP and Lua when using different libraries like mcrypt and OpenSSL, developers should ensure that both sides are using the same encryption algorithm, mode, padding, and key. This means that the parameters used for encryption in PHP should be replicated in Lua for decryption to work correctly.

// PHP encryption code using OpenSSL
$data = "Hello, world!";
$key = openssl_random_pseudo_bytes(32);
$iv = openssl_random_pseudo_bytes(16);
$cipher = "aes-256-cbc";
$encrypted = openssl_encrypt($data, $cipher, $key, OPENSSL_RAW_DATA, $iv);

// Transmit $encrypted, $key, $iv to Lua for decryption