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<?php $a = array('where' => array('uid' => 4)); $b = array('where' => array('label' => 'test')); var_dump(array_merge($a, $b), array_merge_recursive($a, $b));
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(1) { ["where"]=> array(1) { ["label"]=> string(4) "test" } } array(1) { ["where"]=> array(2) { ["uid"]=> int(4) ["label"]=> string(4) "test" } }