<?php
class QAUserClass {
public $filename = 'error.log';
public $isvalid = true;
public function __toString(){
return file_get_contents($this->filename);
}
}

class FileClass2 {
public $filename = 'error.log';
public $isvalid = true;
public $count =10;
public function __toString(){
return file_get_contents($this->filename);
}
}


?>

<?php 

$obj= new QAUserClass();

echo serialize($obj);

?>