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<?php $suggestion = (object) array('Key' => 'pie'); var_dump( array_key_exists('Key', $suggestion), $suggestion['Key'] );
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Uncaught TypeError: array_key_exists(): Argument #2 ($array) must be of type array, stdClass given in /in/2vkO5:6 Stack trace: #0 {main} thrown in /in/2vkO5 on line 6
Process exited with code 255.

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