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<?php $x = [ 'foo' => [], 'biz' => [ 'baz' => [] ] ]; var_dump(array_flatten($x));
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Uncaught Error: Call to undefined function array_flatten() in /in/C03dq:8 Stack trace: #0 {main} thrown in /in/C03dq on line 8
Process exited with code 255.

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