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<?php $array1 = array( 'group 1' => array( 'test 1', 'test 2', 'test 3' ) ); $array2 = array( 'group 1' => array( 'test 1', 'test 4' ), 'group 2' => array( 'test2 1', 'test2 2', 'test 4' ) ); $merged = array_merge($array1, $array2); var_dump($merged);
based on osDTW
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(2) { ["group 1"]=> array(2) { [0]=> string(6) "test 1" [1]=> string(6) "test 4" } ["group 2"]=> array(3) { [0]=> string(7) "test2 1" [1]=> string(7) "test2 2" [2]=> string(6) "test 4" } }