問題描述

我正在嘗試按另一個(gè)數(shù)組對多維數(shù)組進(jìn)行排序，但到目前為止還不夠.
array_multisort 似乎只適用于真正的排序.

I'm trying to sort a multi-dimensional array by another array, but have so far come up short.
array_multisort seems be working only for real sorting.

假設(shè)我有這兩個(gè)數(shù)組:

$order = array(2,3,1);

$data = array(
    array('id' => 1, 'title' => 'whatever'),
    array('id' => 2, 'title' => 'whatever'),
    array('id' => 3, 'title' => 'whatever')
);

現(xiàn)在我想根據(jù)我的 $order 數(shù)組中的順序?qū)ξ业?$data 數(shù)組進(jìn)行排序.
這就是我想要的結(jié)果:

Now I would like to sort my $data array according to the order in my $order array.
This is what I would like the result to be:

$data = array(
    array('id' => 2, 'title' => 'whatever'),
    array('id' => 3, 'title' => 'whatever')
    array('id' => 1, 'title' => 'whatever'),
);

<小時(shí)>

我可以通過運(yùn)行嵌套循環(huán)輕松完成此操作，但這不能很好地?cái)U(kuò)展(我的數(shù)組非常大，并且數(shù)組有更多字段).

I can accomplish this easily by running a nested loop, but that would not scale well (my array is pretty big, and the arrays have many more fields).

推薦答案

PHP 中沒有為此內(nèi)置函數(shù)，我無法想到任何自定義函數(shù)，它可以使用 usort 來做到這一點(diǎn).但是 array_map 已經(jīng)足夠簡單了，imo，為什么不改用它呢?

There is no built-in function for this in PHP and i am unable to think of any custom function, which would do this using usort. But array_map is simple enough, imo, so why not use it instead?

$sorted = array_map(function($v) use ($data) {
    return $data[$v - 1];
}, $order);

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