How does Yii2 determine whether it is an Ajax request?

#Yii2 How to determine whether it is an Ajax request?

Yii2 method of judging Ajax requests: Just judge the "isAjax" attribute in the request class. If it is true, it is an Ajax request, otherwise it is not an Ajax request. The principle is to judge "$_SERVER" "X-Requested-With" is "XMLHttpRequest".

Sample code

Yii::$app->request->isAjax
 
if (Yii::$app->request->isAjax) {
    echo "是";
}

PHP native judgment

jquery will add an X-Requested- to the request header With information, the information content is XMLHttpRequest, so that PHP can use the $_SERVER global array to determine whether it is an ajax request

if (isset($_SERVER["HTTP_X_REQUESTED_WITH"] && strtolower($_SERVER["HTTP_X_REQUESTED_WITH"] == 'xmlhttprequest')){
    // 是ajax请求
} else {
    // 不是ajax请求
}

Recommended tutorial: "Yii Tutorial"

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