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<?php $arr1 = array("a"=>1, "b"=>2, "c"=>3); $arr2 = array("x"=>4, "y"=>5, "z"=>6); foreach($arr1 as $key => &$val) {} foreach($arr2 as $key => $val) {} var_dump($arr1); var_dump($arr2);
Output for git.master, git.master_jit, rfc.property-hooks
array(3) { ["a"]=> int(1) ["b"]=> int(2) ["c"]=> &int(6) } array(3) { ["x"]=> int(4) ["y"]=> int(5) ["z"]=> int(6) }

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