In PHP, a file calls another file class, and then the output is garbled. Solution

In PHP, a file calls a method of another file class, and then the output is garbled. Please solve it!
tt.php file

<?php

 class CTest

 {

 private $m_str;

 public function SetData($data)

 {

 $m_str=$data;

 }

 public function GetData()

 {

 return $m_str;

 }

 }

 

 ?>

File test.php

<?php

 echo "Begin test 
"; //Normal display

 require_once './tt.php';

 $p=new CTest();

 $p->SetData("Could you get this data?");

 $str=$p->GetData();

 echo $str; // Unable to display normally

 ?>

——
Display test.php execution results in the browser
Begin test
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——Solution——————–

class CTest

 {

 Private $m_str;

 Public function SetData($data)

 {

           $this->m_str=$data;

 }

 Public function GetData()

 {

           return $this->m_str;

 }

 }

 

——Solution——————–
Please check whether the encoding of $data is consistent with the page encoding.
——Solution——————–
Set up the page encoding