PHP determines whether it is an ajax request

php determines whether it is an ajax request

Let’s talk about the front-end using jQuery How to distinguish:

When jQuery issues an ajax request, a piece of information named X-Requested-With will be added to the request header. The content of the information is: XMLHttpRequest. You can use $_SERVER[ "HTTP_X_REQUESTED_WITH"] to get. (Note: The dash is replaced by an underscore, which is not case-sensitive)

From this, we can judge whether it is an ajax request:

if(isset($_SERVER["HTTP_X_REQUESTED_WITH"]) && strtolower($_SERVER["HTTP_X_REQUESTED_WITH"])=="xmlhttprequest"){ 
    // ajax 请求的处理方式 }else{ 
    // 正常请求的处理方式 };

When using native JavaScript to issue an ajax request, we can also add information to the header to facilitate back-end students to distinguish. The method is as follows:

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

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