二维数组排序

usort($people, function($a, $b) {

    // 先按照年龄升序排序    if ($a['age'] == $b['age']) {

        // 如果年龄相同，则按照名字字母顺序升序排序        return strcmp($a['name'], $b['name']);

    }

    return $a['age'] - $b['age'];

});

    // self::myOrder($list,'col1', ['c']); //调用

    public static function myOrder(&$list, $field, $orderList)
    {
        $len = count($orderList);
        usort($list, function ($a, $b) use ($field,$orderList, $len) {
            $aIndex = array_search($a[$field], $orderList);
            if ($aIndex === false) {
                $aIndex = $len;
            }
            $bIndex = array_search($b[$field], $orderList);
            if ($bIndex === false) {
                $bIndex = $len;
            }

            return $aIndex - $bIndex;
        });
    }