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<?php
if(!function_exists('my_encrypt')) {
    function my_encrypt($data, $key)
    {
        // Remove the base64 encoding from our key
        $encryption_key = base64_decode($key);
        // Generate an initialization vector
        $iv = openssl_random_pseudo_bytes(openssl_cipher_iv_length('aes-256-cbc'));
        // Encrypt the data using AES 256 encryption in CBC mode using our encryption key and initialization vector.
        $encrypted = openssl_encrypt($data, 'aes-256-cbc', $encryption_key, 0, $iv);
        // The $iv is just as important as the key for decrypting, so save it with our encrypted data using a unique separator (::)
        return base64_encode($encrypted . '::' . $iv);
    }
}
if(!function_exists('my_decrypt')) {
    function my_decrypt($data, $key)
    {
        // Remove the base64 encoding from our key
        $encryption_key = base64_decode($key);
        // To decrypt, split the encrypted data from our IV - our unique separator used was "::"
        list($encrypted_data, $iv) = explode('::', base64_decode($data), 2);
        return openssl_decrypt($encrypted_data, 'aes-256-cbc', $encryption_key, 0, $iv);
    }
}