加入两个数组答案

【问题标题】：Join Two arrays加入两个数组
【发布时间】：2020-09-08 06:59:46
【问题描述】：

我有两个数组，我想将这些数组合并为一个数组。我怎样才能完成这段代码以及我在这里的错误：

下面是我的代码：

$intro = array( array( "name"=>"Peter","age"=>"40","location"=>"USA" ), 
            array("name"=>"Mike","age"=>"55","location"=>"USA")
);

$bikes = array( array( "brand"=>"Hero","cc"=>"150", "rpm"=>"8500"),
            array( "brand"=>"Honda","cc"=>"150", "rpm"=>"9500")
);

$result = array_merge($intro, $bikes);

print_r($result);

合并这两个数组后，我得到了这个结果：

Array
(
    [0] => Array
        (
            [name] => Peter
            [age] => 40
            [location] => USA
        )

    [1] => Array
        (
            [name] => Mike
            [age] => 55
            [location] => USA
        )

    [2] => Array
        (
            [brand] => Hero
            [cc] => 150
            [rpm] => 8500
        )

    [3] => Array
        (
            [brand] => Honda
            [cc] => 150
            [rpm] => 9500
        )

)

但我想得到以下模式：

Array
(
    [0] => Array
        (
            [name] => Peter
            [age] => 40
            [location] => USA
            [brand] => Hero
            [cc] => 150
            [rpm] => 8500
        )
     [1] => Array
        (
            [name] => Mike
            [age] => 55
            [location] => USA
            [brand] => Yamaha
            [cc] => 150
            [rpm] => 9500
            
        )
    

)

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谢谢

【问题讨论】：

您可以使用foreach ($array_expression as $key => $value) { 执行此操作，然后您拥有密钥，并且可以使用该密钥从另一个数组中获取条目，并将其推送到当前的 $value 数组中。

标签： php arrays foreach

【解决方案1】：

如果您希望它们使用键合并和排列，您可以简单地使用 good ol' foreach:

foreach ($intro as $k => $v) {
    $result[] = array_merge($v, $bikes[$k]);
}

或者使用array_map的单线：

$result = array_map('array_merge', $intro, $bikes);

【讨论】：

【解决方案2】：

array_map 带有自定义回调可以提供帮助：

$intro = array( 
    array( "name"=>"Peter","age"=>"40","location"=>"USA" ), 
    array("name"=>"Mike","age"=>"55","location"=>"USA")
);

$bikes = array( 
    array( "brand"=>"Hero","cc"=>"150", "rpm"=>"8500"),
    array( "brand"=>"Honda","cc"=>"150", "rpm"=>"9500")
);

$result = array_map(function($a, $b) {
    // here you merge every subarray from 
    // `$intro` with subarray from `$bikes`
    return array_merge($a, $b);
}, $intro, $bikes);

print_r($result);

小提琴here.

【讨论】：

【解决方案3】：

你可以这样做：

foreach ($intro as $k => $v) {
    $result[] = array_merge($v, $bikes[$k]);
}

结果：

Array
(
[0] => Array
    (
        [name] => Peter
        [age] => 40
        [location] => USA
        [brand] => Hero
        [cc] => 150
        [rpm] => 8500
    )

[1] => Array
    (
        [name] => Mike
        [age] => 55
        [location] => USA
        [brand] => Honda
        [cc] => 150
        [rpm] => 9500
    )
)

【讨论】：

这与@Kevin 的回答有何不同？
都是一样的，我写的比较慢:(