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<?php $array = array('a' => array(1, 2, 3, 4, 5), 'b' => array(6,7,8,9,10)); $ref = &$array; foreach ($array['a'] as $val) { var_dump($val); $array['a'][2] = 0; } var_dump($ref); var_dump($array);
Output for git.master, git.master_jit, rfc.property-hooks
int(1) int(2) int(3) int(4) int(5) array(2) { ["a"]=> array(5) { [0]=> int(1) [1]=> int(2) [2]=> int(0) [3]=> int(4) [4]=> int(5) } ["b"]=> array(5) { [0]=> int(6) [1]=> int(7) [2]=> int(8) [3]=> int(9) [4]=> int(10) } } array(2) { ["a"]=> array(5) { [0]=> int(1) [1]=> int(2) [2]=> int(0) [3]=> int(4) [4]=> int(5) } ["b"]=> array(5) { [0]=> int(6) [1]=> int(7) [2]=> int(8) [3]=> int(9) [4]=> int(10) } }

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