/**
* Encode a PHP object into a JSON string.
*
* @param object|array $input A PHP object or array
*
* @return string JSON representation of the PHP object or array
* @throws DomainException Provided object could not be encoded to valid JSON
*/
public static function jsonEncode($input)
{
$json = json_encode($input);
if (function_exists('json_last_error') && ($errno = json_last_error())) {
JWT::_handleJsonError($errno);
} else {
if ($json === 'null' && $input !== null) {
throw new DomainException('Null result with non-null input');
}
}
return $json;
}