PHP における静的メソッドと非静的メソッドの相互呼び出しに関する簡単な説明

class test{
   
  public static function strPrint(){
    echo &#39;this is strPrint static function<br>&#39;;
  }
   
  public function staticFuncInvoke(){
    self::strPrint();
  }
}
 
$test = new test();
 
$test->staticFuncInvoke();

class test{
   
  public static function strPrint(){
    $this->staticFuncInvoke();
  }
   
  public function staticFuncInvoke(){
    echo 'this is a nonstatic function named staticFuncInvoke';
  }
}
 
test::strPrint();