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<?php $a = array(1=>2); foreach ($a as $key => $val) { $a[$key+1] = $val + 1; var_dump($a); } var_dump($a);
Output for git.master, git.master_jit, rfc.property-hooks
array(2) { [1]=> int(2) [2]=> int(3) } array(2) { [1]=> int(2) [2]=> int(3) }

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