数组映射在PHP中的钥匙 [英] Array mapping in PHP with keys

问题描述

只是出于好奇（我知道这可能是一个单行的foreach 语句），是否有一些PHP阵列功能（或多个组合），鉴于像数组

Just for curiosity (I know it can be a single line foreach statement), is there some PHP array function (or a combination of many) that given an array like:

Array (
    [0] => stdClass Object (
        [id] => 12
        [name] => Lorem
        [email] => [e-mail]
    )
    [1] => stdClass Object (
        [id] => 34
        [name] => Ipsum
        [email] => [e-mail]
    )
)

而且，鉴于ID和'名称'，产生类似：

Array (
    [12] => Lorem
    [34] => Ipsum
)

我使用这个模式很多，我注意到 array_map 在这种情况下很没用，因为你不能指定返回数组的键。

I use this pattern a lot, and I noticed that array_map is quite useless in this scenario cause you can't specify keys for returned array.

推荐答案

只需使用 array_reduce ：

$obj1 = new stdClass;
$obj1 -> id = 12;
$obj1 -> name = 'Lorem';
$obj1 -> email = '[e-mail]';

$obj2 = new stdClass;
$obj2 -> id = 34;
$obj2 -> name = 'Ipsum';
$obj2 -> email = '[e-mail]';

$reduced = array_reduce(
    // input array
    array($obj1, $obj2),
    // fold function
    function(&$result, $item){ 
        // at each step, push name into $item->id position
        $result[$item->id] = $item->name;
        return $result;
    },
    // initial fold container [optional]
    array()
);

这是一个班轮出的意见^^

It's a one-liner out of comments ^^

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