PHP - 如何在数组中合并数组

Question

如何在php中合并n个数组.我的意思是我怎么能这样做:
array_merge(from : $result[0], to : $result[count($result)-1])
OR
array_merge_recursive(from: $result[0], to : $result[count($result) -1])

其中$result包含多个数组的数组在哪里:

$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可以使用可变数量的参数,因此使用一些call_user_func_array技巧可以将$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:

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

更新:

现在使用5.6,我们有...运算符将数组解包到参数中,因此您可以:

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

并得到相同的结果.*

*只要在解压缩的数组中有整数键,结果相同,否则会E_RECOVERABLE_ERROR : type 4096 -- Cannot unpack array with string keys出错.