PHP - 如何合并数组内的数组

Question

如何在php中合并n个数组。我的意思是我该怎么做这样的工作:
array_merge(from : $result[0], to : $result[count($result)-1])
或
array_merge_recursive(from: $result[0], to : $result[count($result) -1])

其中 $result 是一个数组，其中包含多个数组，如下所示:

$result = Array(
0 => array(),//associative array
1 => array(),//associative array
2 => array(),//associative array
3 => array()//associative array
)

我的结果是:

$result = Array(
    0 => Array(
        "name" => "Name",
        "events" => 1,
        "types" => 2
    ),
    1 => Array(
        "name" => "Name",
        "events" => 1,
        "types" => 3
    ),
    2 => Array(
        "name" => "Name",
        "events" => 1,
        "types" => 4
    ),
    3 => Array(
        "name" => "Name",
        "events" => 2,
        "types" => 2
    ),
    4 => Array(
        "name" => "Name",
        "events" => 3,
        "types" => 2
    )
)

而我需要的是

$result = Array(
"name" => "name",
"events" => array(1,2,3),
"types" => array(2,3,4)
)

Answer 1

array_merge可以接受可变数量的参数，所以用一点 call_user_func_array您可以将 $result 数组传递给它:

$merged = call_user_func_array('array_merge', $result);

这基本上就像你输入的那样运行:

$merged = array_merge($result[0], $result[1], .... $result[n]);

更新:

现在有了 5.6，我们有了 ... operator将数组解包为参数，因此您可以:

$merged = array_merge(...$result);

并得到相同的结果。 *

* 只要你在解压后的数组中有整数键，结果相同，否则你会得到 E_RECOVERABLE_ERROR : type 4096 -- Cannot unpack array with string keys 错误。