按最高值排序数组

Question

我想按得分最高值对数组顺序进行排序。

它是一个json数据

"score":[
    {
        "userId":"5",
        "playtime":"1396369254",
        "score":"25"
    },
    {
        "userId":"1",
        "playtime":"1396369056",
        "score":"12"
    },
    {
        "userId":"2",
        "playtime":"1396369240",
        "score":"100"
    }
],

这里得分100将是第一个指数

Answer 1

使用php的函数usort http://www.php.net/manual/en/function.usort.php

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

usort($DATA, "cmp");