- property_exists: documentation ( source)
- print_r: documentation ( source)
<?php
$obj = (object)array('123a' => '456');
print_r($obj);
if (!property_exists($obj,'123a')) echo 'property 123a does not exist',"\n";
echo !isset($obj->{'123a'})? 'property 123a is null' : $obj->{'123a'}, "\n";