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<?php $arr = [ 'q' => 'qwe' ]; var_dump(key_exists($arr['z']) && $arr['z'] === 'qwe');
based on 9FApX
Output for 5.6.38 - 7.3.0rc3
Notice: Undefined index: z in /in/TobmC on line 7 Warning: key_exists() expects exactly 2 parameters, 1 given in /in/TobmC on line 7 bool(false)