$inboxf = $field['url']; $plain_txt = base64_encode($inboxf); $string = $plain_txt; $encrypt_method = "AES-256-CBC"; $secret_key = 'This is my secret key'; $secret_iv = 'This is my secret iv'; // 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); $output = openssl_encrypt($string, $encrypt_method, $key, 0, $iv); $output = base64_encode($output); $encrypted_txt = $output; $urlen = $encrypted_txt; ?>