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<?php $a = array(1,2,3,4); print_r($a); array_walk($a, function(&$item) use ($a) { $item *= 2; }); print_r($a);
Output for git.master, git.master_jit, rfc.property-hooks
Array ( [0] => 1 [1] => 2 [2] => 3 [3] => 4 ) Array ( [0] => 2 [1] => 4 [2] => 6 [3] => 8 )

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