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<?php $array = array('foo' => array('bar')); var_dump(key(key($array)));
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Uncaught TypeError: key(): Argument #1 ($array) must be of type array, string given in /in/vjbt9:3 Stack trace: #0 /in/vjbt9(3): key('foo') #1 {main} thrown in /in/vjbt9 on line 3
Process exited with code 255.

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