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<?php $a = array(1,5,16,7,4); asort($a); array_walk($a, function(&$value) { ++$value; }); var_dump(array_keys($a));
Output for git.master, git.master_jit, rfc.property-hooks
array(5) { [0]=> int(0) [1]=> int(4) [2]=> int(1) [3]=> int(3) [4]=> int(2) }

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