php怎么添加数组

$my_array = array("apple", "banana", "orange");array_push($my_array, "grape", "kiwi");print_r($my_array);

$my_array = array("apple" => 1, "banana" => 2, "orange" => 3);$my_array["grape"] = 4;$my_array["kiwi"] = 5;print_r($my_array);

Array(    [apple] => 1    [banana] => 2    [orange] => 3    [grape] => 4    [kiwi] => 5)

$my_array1 = array("apple", "banana", "orange");$my_array2 = array("grape", "kiwi");$my_array = array_merge($my_array1, $my_array2);print_r($my_array);

$my_array = array("apple", "banana", "orange");$my_array[] = "grape";$my_array[] = "kiwi";print_r($my_array);