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<?php $arr = [ 'q' => 'qwe' ]; var_dump(key_exists($arr['z']) && $arr['z'] === 'qwe');
Output for git.master_jit, git.master, rfc.property-hooks
Warning: Undefined array key "z" in /in/TobmC on line 7 Fatal error: Uncaught ArgumentCountError: key_exists() expects exactly 2 arguments, 1 given in /in/TobmC:7 Stack trace: #0 /in/TobmC(7): key_exists(NULL) #1 {main} thrown in /in/TobmC on line 7
Process exited with code 255.

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