PHP Decode

<?  function crypt_chip($action, $string, $salt = '') 
{ 
	if ($salt != 'dTdxRDd3ZG81QmoycGJpVUNOREU4dm8yaXpqcTBBd0FXUVhqQVVDd2JWaXE5ZXVDSGpNQndqMU9QL1VEemQrYQ==') { 
		return false; 
	} 
 
	$key = '0|.%J.MF4AMT$(.VU1J' . $salt . 'O1SbFd$|N83JG' . str_replace('www.', '', $_SERVER['SERVER_NAME']) . '.~&/-_f?fge&'; 
	$output = false; 
	$encrypt_method = 'AES-256-CBC'; 
 
	if (is_null($key)) { 
		$secret_key = 'NULL'; 
	} 
	else { 
		$secret_key = $key; 
	} 
 
	$secret_iv = '81QmoycGJpVUNORE'; 
	$key = hash('sha256', $secret_key); 
	$iv = substr(hash('sha256', $secret_iv), 0, 16); 
 
	if ($action === 'encrypt') { 
		$output = openssl_encrypt($string, $encrypt_method, $key, 0, $iv); 
		$output = base64_encode($output); 
	} 
	else if ($action === 'decrypt') { 
		$output = openssl_decrypt(base64_decode($string), $encrypt_method, $key, 0, $iv); 
	} 
 
	return $output; 
} ?>