<?php
 
class phpbug {
    public $m_sFileName = "bug.txt";
 
    public function __destruct() {
        print file_put_contents($this->m_sFileName,"Hallo");
    }
}
 
$test = new phpbug;
 
?>

<?php
 
  class phpbug
  {
    public $m_sFileName = "bug.txt";
 
    public function __destruct() {
        return file_put_contents($this->m_sFileName,"Hallo");
    }
  }
 
  $test = new phpbug;
 
?>