Yii2 implementation method using AJAX to return JSON _php instance

This example describes the implementation of YII2 using AJAX to return JSON. Share to everyone for your reference, specific as follows:

Public Function Actionajax ()
{
  if (Isset (Yii:: $app->request->post (' test ')) {
    $test = "Ajax worked!";
    //Do your query stuff here
  } else{
    $test = "Ajax failed";
    Do your query stuff here
  }
  //return Json return
  \yii\helpers\json::encode ($test);

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I hope this article will help you with the PHP program design based on the YII framework.