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<?php $ao = new ArrayObject([2, 3, 8, 9]); var_dump(array_walk_recursive($ao->getArrayCopy(), function($item, $key){ echo $key . ' => ' . $item . PHP_EOL; }));
Output for git.master, git.master_jit, rfc.property-hooks
Notice: Only variables should be passed by reference in /in/cqgNj on line 5 0 => 2 1 => 3 2 => 8 3 => 9 bool(true)

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