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<?php function f(array $a) { foreach ($a as &$i) { foreach ($i as &$j) { $j = 4; } } } $v = [[1], [2]]; f($v); var_dump($v);
Output for git.master, git.master_jit, rfc.property-hooks
array(2) { [0]=> array(1) { [0]=> int(1) } [1]=> array(1) { [0]=> int(2) } }

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