What are the potential pitfalls when upgrading from PHP 7.1 to 7.2 due to the removal of mcrypt functions?

When upgrading from PHP 7.1 to 7.2, one potential pitfall is the removal of mcrypt functions, which can cause compatibility issues with existing code that relies on these functions for encryption and decryption. To solve this issue, you can replace the mcrypt functions with the recommended alternative, such as the OpenSSL extension. 

// Replace mcrypt_encrypt and mcrypt_decrypt with OpenSSL functions
function encrypt_data($data, $key) {
    $iv = openssl_random_pseudo_bytes(openssl_cipher_iv_length('aes-256-cbc'));
    $encrypted = openssl_encrypt($data, 'aes-256-cbc', $key, 0, $iv);
    return base64_encode($iv . $encrypted);
}

function decrypt_data($data, $key) {
    $data = base64_decode($data);
    $iv = substr($data, 0, openssl_cipher_iv_length('aes-256-cbc'));
    $encrypted = substr($data, openssl_cipher_iv_length('aes-256-cbc'));
    return openssl_decrypt($encrypted, 'aes-256-cbc', $key, 0, $iv);
}

Keywords

PHP 7.2 mcrypt functions encryption deprecated security vulnerability

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