是的，array_merge函数支持多维数组。当使用array_merge函数合并多维数组时，它会将多个数组合并成一个新数组，保持原始数组的结构。例如：
$array1 = array("a" => array("red"), "b" => array("green", "blue"));
$array2 = array("a" => array("yellow"), "b" => array("purple"));
$result = array_merge($array1, $array2);
print_r($result);
输出结果为：
Array
(
[a] => Array
(
[0] => red
[1] => yellow
)
[b] => Array
(
[0] => green
[1] => blue
[2] => purple
)
)
