php ajax请求和返回

        define(\'NOW_TIME\',      $_SERVER[\'REQUEST_TIME\']);
        define(\'REQUEST_METHOD\',$_SERVER[\'REQUEST_METHOD\']);
        define(\'IS_GET\',        REQUEST_METHOD ==\'GET\' ? true : false);
        define(\'IS_POST\',       REQUEST_METHOD ==\'POST\' ? true : false);
        define(\'IS_PUT\',        REQUEST_METHOD ==\'PUT\' ? true : false);
        define(\'IS_DELETE\',     REQUEST_METHOD ==\'DELETE\' ? true : false);
        define(\'IS_AJAX\',       ((isset($_SERVER[\'HTTP_X_REQUESTED_WITH\']) && strtolower($_SERVER[\'HTTP_X_REQUESTED_WITH\']) == \'xmlhttprequest\') || !empty($_POST[C(\'VAR_AJAX_SUBMIT\')]) || !empty($_GET[C(\'VAR_AJAX_SUBMIT\')])) ? true : false);

 

function ajaxReturn($code, $msg = \'\', $data = array(), $redirect = \'\') {
    $data = array(
        \'code\' => $code,
        \'message\' => $msg,
        \'data\' => $data,
        \'redirect\' => $redirect
    );
    header(\'Content-Type:application/json; charset=utf-8\');
    exit(jsonEncode($data));
}