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<?php $z = 'zee'; $o = new stdClass($a=28); $arr = get_defined_vars(); var_dump($arr['z'],$arr['a']);
Output for 7.1.0
string(3) "zee" int(28)
Output for 5.3.0 - 7.0.14
Notice: Undefined index: a in /in/9oprv on line 5 string(3) "zee" NULL
Output for 4.3.0 - 5.2.17
Notice: Undefined index: a in /in/9oprv on line 5 string(3) "zee" NULL