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<?php class MergeVariableList extends ArrayObject {} $a = new MergeVariableList(); $a['test'] = 'toto'; echo $a['test']; var_dump(array_keys($a));
Output for git.master, git.master_jit, rfc.property-hooks
toto Fatal error: Uncaught TypeError: array_keys(): Argument #1 ($array) must be of type array, MergeVariableList given in /in/GRFlU:9 Stack trace: #0 /in/GRFlU(9): array_keys(Object(MergeVariableList)) #1 {main} thrown in /in/GRFlU on line 9
Process exited with code 255.

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