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<?php $v_4 = [ [1, 2, 3], [4, 5, 6], ]; $v_5 = [ [7, 8, 9], [10, 11, 12], ]; foreach ($v_4 as $i => &$row) { foreach ($row as $k => &$v) { $v += $v_5[$i][$k]; } } var_export($v_4);
Output for git.master, git.master_jit, rfc.property-hooks
array ( 0 => array ( 0 => 8, 1 => 10, 2 => 12, ), 1 => array ( 0 => 14, 1 => 16, 2 => 18, ), )

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