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1function my_crypt($string, $action = 'E')
2{
3    $secret_key = 'my_simple_secret_key';
4    $secret_iv = 'my_simple_secret_iv';
5
6    $output = false;
7    $encrypt_method = "AES-256-CBC";
8    $key = hash('sha256', $secret_key);
9    $iv = substr(hash('sha256', $secret_iv), 0, 16);
10
11    if ($action == 'E') {
12        $output = base64_encode(openssl_encrypt($string, $encrypt_method, $key, 0, $iv));
13    } else if ($action == 'D') {
14        $output = openssl_decrypt(base64_decode($string), $encrypt_method, $key, 0, $iv);
15    }
16
17    return $output;
18}