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<?php $o = new ArrayObject(); if (array_key_exists('a', $o)) { echo "has-a"; } else { echo "NO-a"; }
Output for git.master_jit, git.master, rfc.property-hooks
Fatal error: Uncaught TypeError: array_key_exists(): Argument #2 ($array) must be of type array, ArrayObject given in /in/2kVLe:4 Stack trace: #0 {main} thrown in /in/2kVLe on line 4
Process exited with code 255.

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