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<?php error_reporting(E_ALL); $foo = array('bar' => array('baz' => 5)); $bar = array('box' => 'baz'); var_dump(isset($foo['bar'][$bar['boom']]));
based on VII0i
Output for 5.3.0 - 7.2.6
Notice: Undefined index: boom in /in/srm5f on line 5 bool(false)
Output for 4.3.0 - 5.2.17
Notice: Undefined index: boom in /in/srm5f on line 5 bool(false)