PHP 二维数组排序 方便~~
array_multisort() 对二维数组进行排序http://www.ucantech.net/网站推广
数组$roughData，我们打算按照accurancy排序。

Array
(
[0] => Array
(
[username] => 10yl
[accuracy] => 0.00
)

[1] => Array
(
[username] => 11yl
[accuracy] => 1.00
)

[2] => Array
(
[username] => 12yl
[accuracy] => 0.00
)

[3] => Array
(
[username] => 13yl
[accuracy] => 1.00
)
)

方法：
（1）提取accuracy列数组

foreach ($roughData as $key => $row) {
$usernames[$key] = $row['username'];
$accuracy[$key] = $row['accuracy'];
}

（2）进行排序

array_multisort($accuracy, SORT_ASC,$roughData);

当print_r($roughData);后我们将得到一个按accuracy升序排序的二维数组(fblww-1230)