Online PHP editor | output for at29n

<?php class one{ public static $i =0; public function index($called_from = null){ if ( $called_from != 'myfunc') { return $this->myfunc(__FUNCTION__); } self::$i+= 1; echo self::$i: echo 'parent'; } public function myfunc($called_from){ return $this->index(__FUNCTION__); } } class two extends one{ function index($called_from = null){ if ( $called_from != 'myfunc') { return $this->myfunc(__FUNCTION__); } echo 'child'; } } $obj = new one; $obj->index();