Online PHP editor | refs for Gq9PP

<?php class A { protected $_vars = array(); public function __get($var) { echo "__get called\n"; return $this->_vars[$var]; } public function __set($var, $val) { echo "__set called\n"; $this->_vars[$var] = $val; } public function __isset($var) { echo "__isset called\n"; return isset($this->_vars[$var]); } } $o = new A(); $o->a = 1; $o->b = 2; $c = $o->b = 3; var_dump($c); //3 var_dump($o->b); //3 var_dump(empty($o->b));