Php determines whether it is an ajax request method, and php judges an ajax request

Php determines whether it is an ajax request method, and php judges an ajax request

The example in this article describes how to determine whether php is an ajax request. We will share this with you for your reference. The details are as follows:

First, how to differentiate the front-end when using jQuery:

When jQuery sends an ajax request, a message named X-Requested-With is added to the request header. The message content is XMLHttpRequest.

You can use $ _ SERVER ["HTTP_X_REQUESTED_WITH"] On the backend to obtain the data. (Note: The dashes are replaced by underscores, which are case-insensitive)

Therefore, we can determine whether the request is an ajax request:

If (isset ($ _ SERVER ["HTTP_X_REQUESTED_WITH"]) & strtolower ($ _ SERVER ["HTTP_X_REQUESTED_WITH"]) = "xmlhttprequest ") {// ajax request processing method} else {// normal request processing method };

When using native JavaScript to send an ajax request, we can also add information to the header to facilitate the differentiation of backend students. The method is as follows:

Var xmlhttp = new XMLHttpRequest (); xmlhttp. open ("GET", "test. php ", true); xmlhttp. setRequestHeader ("X-Requested-With", "XMLHttpRequest"); xmlhttp. send ();