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<?php function f(&$array, $index, $value) { $v =& $array; foreach ($index as $i) { $v =& $v[$i]; } $v = $value; } $arr = [ 'a' => [ 'a1' => [ 'A11', 'A12', 'A13' ] ] ]; f($arr, ['a', 'a1', 2], 'A13 New'); var_dump($arr);
Output for git.master, git.master_jit, rfc.property-hooks
array(1) { ["a"]=> array(1) { ["a1"]=> array(3) { [0]=> string(3) "A11" [1]=> string(3) "A12" [2]=> string(7) "A13 New" } } }

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