php与http（php预定义变量）
var_dump($_SERVER['REQUEST_URI']);
var_dump($this->request->getRequestType());
var_dump($this->request->getIsAjaxRequest());

//打印信息
string(87) "/oms07/index.php?r=preShow/searchFails&idcName=JX&fromTime=2012-02-29&toTime=2012-02-29"
string(3) "GET"
bool(false)


PHP provides a large number of predefined variables to all scripts. The variables represent everything from external variables to built-in environment variables, last error messages to last retrieved headers.

    Superglobals — Superglobals are built-in variables that are always available in all scopes
    $GLOBALS — References all variables available in global scope
    $_SERVER — Server and execution environment information
    $_GET — HTTP GET variables
    $_POST — HTTP POST variables
    $_FILES — HTTP File Upload variables
    $_REQUEST — HTTP Request variables
    $_SESSION — Session variables
    $_ENV — Environment variables
    $_COOKIE — HTTP Cookies
    $php_errormsg — The previous error message
    $HTTP_RAW_POST_DATA — Raw POST data
    $http_response_header — HTTP response headers
    $argc — The number of arguments passed to script
    $argv — Array of arguments passed to script