一尘不染

PHP-如何在数组内合并数组

php

如何在PHP中合并n个数组 我的意思是我怎么可以这样做的工作:
array_merge(from : $result[0], to : $result[count($result)-1])
OR
array_merge_recursive(from: $result[0], to : $result[count($result) -1])

$result里面有多个数组的数组在哪里,像这样:

$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
    )
)

我需要的是

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

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2020-05-29

共1个答案

一尘不染

array_merge可以接受可变数量的参数,因此,使用一些call_user_func_array技巧,您可以将$result数组传递给它:

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

基本上可以像输入以下内容一样运行:

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

更新:

现在有了5.6,我们有了...运算符来将数组解压缩为参数,因此您可以:

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

并具有相同的结果。*

*如果在解压缩数组中具有整数键,则结果相同,否则会出现E_RECOVERABLE_ERROR : type 4096 -- Cannot unpack array with string keys错误。

2020-05-29