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<?php $data = [ 1 => [ ['id' => 491, 'default' => false], ['id' => 492, 'default' => false], ['id' => 493, 'default' => true], ], 2 => [ ['id' => 491, 'default' => false], ['id' => 492, 'default' => true], ['id' => 493, 'default' => false], ['id' => 494, 'default' => false], ], ]; $id = 'id'; $result = array_column($data[1], null, $id) + array_column($data[2], null, $id) ; print_r($result); print_r(array_values($result));
Output for git.master, git.master_jit, rfc.property-hooks
Array ( [491] => Array ( [id] => 491 [default] => ) [492] => Array ( [id] => 492 [default] => ) [493] => Array ( [id] => 493 [default] => 1 ) [494] => Array ( [id] => 494 [default] => ) ) Array ( [0] => Array ( [id] => 491 [default] => ) [1] => Array ( [id] => 492 [default] => ) [2] => Array ( [id] => 493 [default] => 1 ) [3] => Array ( [id] => 494 [default] => ) )

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