Multidimensional array sorting

I have a number of groups

[    ["id"=>3],    ["id"=>1],     ["id"=>2]]

Now you want to sort by the ascending ID.

[    ["id"=>1],    ["id"=>2],     ["id"=>3]]

What should I do? It is best to borrow built-in functions.

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I have a number of groups

[    ["id"=>3],    ["id"=>1],     ["id"=>2]]

Now you want to sort by the ascending ID.

[    ["id"=>1],    ["id"=>2],     ["id"=>3]]

What should I do? It is best to borrow built-in functions.

http://php.net/manual/en/function.usort.php

usort($arr, 'cmp');function cmp($a, $b){    if ($a['id'] == $b['id']) {        return 0;    }    return ($a['id'] < $b['id']) ? -1 : 1;}

If we can make sure that value is int type,

usort($arr, 'cmp');function cmp($a, $b){    return $a['id'] - $b['id'];}

$data=当前数组；foreach($data as $d){    $arr[$data['id']]=$d;}print_r($arr);

Look, write a function, general, http://blog.csdn.net/igo9go_zq/article/details/48138405.

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