PHP to determine whether a request is an AJAX request or an ordinary request _php tutorial

In a PHP program, how to tell if a Web request is an AJAX request or a normal request? We often have such a problem in the project, the browser can directly input the address of my Ajax submission, the browsers will be able to directly request data and print data to the page. From the rigor and safety of the procedure, I find this very bad.

However, due to the limited level, this problem was not solved until today, I hereby leave the article for those who have the need to learn.

First of all, the principle: When sending an AJAX request, we can create a custom header message by XMLHttpRequest This object, if you are using a native Ajax method, that is, an Ajax method that is not wrapped with jquery or another JS framework, Then the code is as follows:

Xmlhttprequest.setrequestheader ("Request_type", "Ajax");

In addition, with the $.ajax () method of the jquery wrapper, we can easily create our own custom header information before sending an AJAX request, as shown in the following example:

$.ajax ({type: "GET", Url:base_url + ' php_check_ajax_request/get_user_list.html ', beforesend:function (XMLHttpRequest {Xmlhttprequest.setrequestheader ("Request_type", "Ajax"),},success:function (data) {$ ("#user_list"). HTML (data); $ Tip.hide (); $button. attr (' disabled ', true);});

There is a sentence in the above code:

Xmlhttprequest.setrequestheader ("Request_type", "Ajax");

This code is to create a custom variable "Request_type" into the header information. This variable receives the variable in PHP as follows:

$_server[' Http_request_type ']

So, for the problems raised in this article, we can determine the way a user sends a request in this way.

 
It should be stated that the value of the variable "Request_type" is custom, and you can customize it arbitrarily, such as "Test", "Is_ajax" and so on.
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