How does yii determine whether it is an ajax submission?

The method to determine whether it is an ajax submission is as follows:

(Related tutorials recommended: yii framework)

public function actionDelete() {         
    if (Yii::$app->request >isAjax) {             
        // request is ajax request        
    }         
    else {            
     // not ajax request             
    // for example redirect         
    } 
}

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