PHP - 如何合并数组内的数组

PHP - How to merge arrays inside array

提问by Lekhnath

How to merge n number of array in php. I mean how can I do the job like :
array_merge(from : $result[0], to : $result[count($result)-1])
OR
array_merge_recursive(from: $result[0], to : $result[count($result) -1])

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

Where $resultis an array with multiple arrays inside it like this :

$result里面有多个数组的数组在哪里，如下所示：

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

My Result is :

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
    )
)

And what I need is

我需要的是

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

回答by complex857

array_mergecan take variable number of arguments, so with a little call_user_func_arraytrickery you can pass your $resultarray to it:

array_merge可以接受可变数量的参数，因此通过一些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);

This basically run like if you would have typed:

这基本上就像你输入的一样：

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

Update:

更新：

Now with 5.6, we have the ...operatorto unpack arrays to arguments, so you can:

现在在 5.6 中，我们有了将数组解包为参数的...运算符，因此您可以：

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

And have the same results. *

并有相同的结果。*

* The same results as long you have integer keys in the unpacked array, otherwise you'll get an E_RECOVERABLE_ERROR : type 4096 -- Cannot unpack array with string keyserror.

* 只要解包数组中有整数键，结果相同，否则会E_RECOVERABLE_ERROR : type 4096 -- Cannot unpack array with string keys出错。

回答by amurrell

If you would like to:

如果您想：

• check that each param going into array_merge is actually an array
• specify a particular property within one of the arrays to merge by

• 检查进入 array_merge 的每个参数实际上是一个数组
• 指定要合并的数组之一中的特定属性

You can use this function:

您可以使用此功能：

function mergeArrayofArrays($array, $property = null)
{
    return array_reduce(
        (array) $array, // make sure this is an array too, or array_reduce is mad.
        function($carry, $item) use ($property) {

            $mergeOnProperty = (!$property) ?
                    $item :
                    (is_array($item) ? $item[$property] : $item->$property);

            return is_array($mergeOnProperty)
                ? array_merge($carry, $mergeOnProperty)
                : $carry;
    }, array()); // start the carry with empty array
}

Let's see it in action.. here's some data:

让我们看看它的实际效果……这里有一些数据：

Simple structure: Pure array of arrays to merge.

结构简单：要合并的纯数组数组。

$peopleByTypesSimple = [
    'teachers' => [
            0  => (object) ['name' => 'Ms. Jo', 'hair_color' => 'brown'],
            1  => (object) ['name' => 'Mr. Bob', 'hair_color' => 'red'],
    ],

    'students' => [
            0  => (object) ['name' => 'Joey', 'hair_color' => 'blonde'],
            1  => (object) ['name' => 'Anna', 'hair_color' => 'Strawberry Blonde'],
    ],

    'parents' => [
            0  => (object) ['name' => 'Mr. Howard', 'hair_color' => 'black'],
            1  => (object) ['name' => 'Ms. Wendle', 'hair_color' => 'Auburn'],
    ],
];

Less simple: Array of arrays, but would like to specify the peopleand ignorethe count.

减简单：数组的数组，但想指定的人，并忽略的计数。

$peopleByTypes = [
    'teachers' => [
        'count' => 2,
        'people' => [
            0  => (object) ['name' => 'Ms. Jo', 'hair_color' => 'brown'],
            1  => (object) ['name' => 'Mr. Bob', 'hair_color' => 'red'],
        ]
    ],

    'students' => [
        'count' => 2,
        'people' => [
            0  => (object) ['name' => 'Joey', 'hair_color' => 'blonde'],
            1  => (object) ['name' => 'Anna', 'hair_color' => 'Strawberry Blonde'],
        ]
    ],

    'parents' => [
        'count' => 2,
        'people' => [
            0  => (object) ['name' => 'Mr. Howard', 'hair_color' => 'black'],
            1  => (object) ['name' => 'Ms. Wendle', 'hair_color' => 'Auburn'],
        ]
    ],
];

Run it

运行

$peopleSimple = mergeArrayofArrays($peopleByTypesSimple);
$people = mergeArrayofArrays($peopleByTypes, 'people');

Results - Both return this:

结果 - 两者都返回：

Array
(
    [0] => stdClass Object
        (
            [name] => Ms. Jo
            [hair_color] => brown
        )

    [1] => stdClass Object
        (
            [name] => Mr. Bob
            [hair_color] => red
        )

    [2] => stdClass Object
        (
            [name] => Joey
            [hair_color] => blonde
        )

    [3] => stdClass Object
        (
            [name] => Anna
            [hair_color] => Strawberry Blonde
        )

    [4] => stdClass Object
        (
            [name] => Mr. Howard
            [hair_color] => black
        )

    [5] => stdClass Object
        (
            [name] => Ms. Wendle
            [hair_color] => Auburn
        )

)

---

---

Extra Fun: If you want to single out one property in an array or object, like "name" from an arrayof people objects(or associate arrays), you can use this function

额外的乐趣：如果你想在一个数组或对象中挑出一个属性，比如从一组人对象（或关联数组）中挑选出“名字” ，你可以使用这个函数

function getSinglePropFromCollection($propName, $collection, $getter = true)
{
    return (empty($collection)) ? [] : array_map(function($item) use ($propName) {
        return is_array($item) 
            ? $item[$propName] 
            : ($getter) 
                ? $item->{'get' . ucwords($propName)}()
                : $item->{$propName}
    }, $collection);
}

The getter is for possibly protected/private objects.

getter 用于可能受保护/私有的对象。

$namesOnly = getSinglePropFromCollection('name', $peopleResults, false);

$namesOnly = getSinglePropFromCollection('name', $peopleResults, false);

returns

返回

Array
(
    [0] => Ms. Jo
    [1] => Mr. Bob
    [2] => Joey
    [3] => Anna
    [4] => Mr. Howard
    [5] => Ms. Wendle
)

回答by Friedrich

I really liked the answer from complex857 but it didn't work for me, because I had numeric keys in my arrays that I needed to preserve.

我真的很喜欢 complex857 的答案，但它对我不起作用，因为我的数组中有需要保留的数字键。

I used the +operator to preserve the keys (as suggested in PHP array_merge with numerical keys) and used array_reduceto merge the array.

我使用+运算符来保留键（如PHP array_merge 中建议的带有数字键）并用于array_reduce合并数组。

So if you want to merge arrays inside an array while preserving numerical keys you can do it as follows:

因此，如果您想在保留数字键的同时合并数组内的数组，您可以按如下方式进行：

<?php
$a = [
    [0 => 'Test 1'],
    [0 => 'Test 2', 2 => 'foo'],
    [1 => 'Bar'],
];    

print_r(array_reduce($a, function ($carry, $item) { return $carry + $item; }, []));
?>

Result:

结果：

Array
(
    [0] => Test 1
    [2] => foo
    [1] => Bar
)

回答by Jayram

Try this

尝试这个

$result = array_merge($array1, $array2);

Or, instead of array_merge, you can use the + op which performs a union:

或者，您可以使用执行联合的 + 操作代替 array_merge：

$array2 + array_fill_keys($array1, '');