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<?php $array = ['foo'=>1, 'bar'=>2]; foreach($array as $k=>&$v) { $array['bernard']=3; echo key($v); }
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Uncaught TypeError: key(): Argument #1 ($array) must be of type array, int given in /in/0B4UF:7 Stack trace: #0 /in/0B4UF(7): key(1) #1 {main} thrown in /in/0B4UF on line 7
Process exited with code 255.

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