PHP determines the ajax request type (HTTP_X_REQUESTED_WITH)

Source: Internet
Author: User
Tags json


In php, an ajax request is determined at the header layer. The corresponding result is determined by $ _ SERVER ['http _ X_REQUESTED_WITH.

The code is as follows: Copy code

/**
* Whether the current request is an ajax request
  *
* @ Access public
* @ Return bool
*/
Function isAjax ()
 {
Return isset ($ _ SERVER ['http _ X_REQUESTED_WITH ']) & strtolower ($ _ SERVER ['http _ X_REQUESTED_WITH']) = 'xmlhttprequest ';
 }

Generally, $ _ SERVER ['http _ X_REQUESTED_WITH '] is XMLHttpRequest by default.


Ajax cross-origin can only specify data in the jsonp format. This is not an XMLHttpRequest object. Even if you customize a $ _ SERVER ['http _ X_REQUESTED_WITH '], it is meaningless.

Solution:
Getjson or ajax (jsonp) for cross-origin requests can be determined using the ACCEPT request header format.

PHP end corresponds to $ _ SERVER ['http _ ACCEPT ']

Jsonp requests are generally text/javascript, application/javascript ,*/*

Json request: application/json, text/javascript ,*/*

A simple cross-origin ajax request:

The code is as follows: Copy code

Switch ($ _ SERVER ['http _ ACCEPT ']) {
Case 'application/json, text/javascript ,*/*':
// JSON format
Break;
Case 'text/javascript, application/javascript ,*/*':
// Javascript or JSONP format
Break;
Case 'text/html ,*/*':
// HTML format
Break;
Case 'application/xml, text/xml ,*/*':
// XML format
Break;
}

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