How to create our own function in Laravel

I'm trying to add some function into Laravel like encrypting or decrypting a value, formatting paragraph etc

Currently I have added my function into controller class like this

public static function encrypt_decrypt($action, $string) {
    $output = false;

    $encrypt_method = "AES-256-CBC";
    $secret_key = 'secret';
    $secret_iv = 'secret_2';

    // hash
    $key = hash('sha256', $secret_key);

    // iv - encrypt method AES-256-CBC expects 16 bytes - else you will get a warning
    $iv = substr(hash('sha256', $secret_iv), 0, 16);

    if ($action == 'encrypt') {
        $outputs = openssl_encrypt($string, $encrypt_method, $key, 0, $iv);
        $output = base64_encode($outputs);
    } else if ($action == 'decrypt') {
        $output = openssl_decrypt(base64_decode($string), $encrypt_method, $key, 0, $iv);
    }

    return $output;
}

Now currently I'm calling my function like

The above method works Perfectly but doesn't seem nice and correct to me, because writing the whole path makes it difficult.

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