- var_dump: documentation ( source)
<?php
$obj = (object)array('apple' => '456');
var_dump($obj);
var_dump($obj->{'apple'}); // Notice: Undefined property: stdClass::$123
echo $obj->apple;
$obj = (object)array('123' => '456');
var_dump($obj);
var_dump($obj->{'123'}); // Notice: Undefined property: stdClass::$123