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<?php $store = array(); $first = array('one' => 1, 'two' => 2); $store = $first; var_dump($store); $second = array('two' => 2, 'three' => 3); $store = array_diff_assoc(array_merge($store, $second), $store); var_dump($store);
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.8 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
array(2) { ["one"]=> int(1) ["two"]=> int(2) } array(1) { ["three"]=> int(3) }

preferences:
246.32 ms | 406 KiB | 354 Q