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<?php $data['one'] = 1; $data += [ "two" => 2 ]; $data += [ "three" => 3 ]; $data += [ "four" => 4 ]; var_dump($data);
based on YmsXo
Output for 5.6.30, hhvm-3.18.5 - 3.22.0, 7.0.30 - 7.3.0rc3
array(4) { ["one"]=> int(1) ["two"]=> int(2) ["three"]=> int(3) ["four"]=> int(4) }