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<?php print_r(array_map(function ($x, $y) { if ($x % 2) { return ['elems' => [$x, $y]]; } else { return null; } }, [1, 2, 3], ['a', 'b', 'c']));
Output for git.master, git.master_jit, rfc.property-hooks
Array ( [0] => Array ( [elems] => Array ( [0] => 1 [1] => a ) ) [1] => [2] => Array ( [elems] => Array ( [0] => 3 [1] => c ) ) )

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