PHP judges whether a request is an AJAX request or a common request _ PHP Tutorial

PHP judges whether a request is an AJAX request or a common request. In a PHP program, how does one determine whether a webpage request is an ajax request or a common request? We often have this problem in projects. in a browser, I directly input my ajax submitted in the PHP program. how can I determine whether a webpage request is an ajax request or a common request? This problem often exists in projects. after entering the address submitted by my ajax in the browser, the browser can directly request data and print the data to the page. In terms of program rigor and security, I think this is very bad.

However, due to the limited level, this problem was not solved until today. I will leave an article for anyone who needs it to learn.

First, let's talk about the principle: when sending an ajax request, we can use the XMLHttpRequest object to create custom header information. if you are using a native ajax method, that is, the ajax method is not packaged using jquery or other js frameworks. the code is as follows:

xmlHttpRequest.setRequestHeader("request_type","ajax");

In addition, using the $. ajax () method encapsulated by jquery, we can easily create custom header information before sending an ajax request, for 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);}});

The above code contains the following sentence:

XMLHttpRequest.setRequestHeader(“request_type”,”ajax”);

This code creates a custom variable "request_type" to the header information ". The variable received in php is as follows:

$_SERVER['HTTP_REQUEST_TYPE']

For the questions raised in this article, we can use the following method to determine which method the user sends the request.

 
It should be noted that the variable value "request_type" is customized and can be customized at will, such as "test" and "is_ajax.
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Why? We often have such a problem in our projects. in the browser, we directly input the content submitted by my ajax...