php MyNews 调用栏目信息（缓存方式）

MyNews 新闻文章管理中调用栏目信息的代码。

调用栏目（缓存）

function getCategorys () {
    global $mysql, $cfg_cache_category;
    $cache = SYSPATH . "/data/cache/categorys.php";
    if (!file_exists($cache) || (time() - filemtime($cache)) > $cfg_cache_category) {
        $categorys = array();
        $arrays = $mysql->getArrays("SELECT id, fid, name, url FROM my_category");
        if (!empty($arrays)) {
            foreach ($arrays as $v) {
                $categorys[$v['id']] = $v;
            }
            unset($arrays);
            unset($v);
        }
        $fp = fopen($cache, 'w');
        if ($fp) {
            fwrite($fp, serialize($categorys));
            fclose($fp);
        } else {
            httpError(500, "写入栏目缓存文件失败");
        }
        unset($categorys);
    }
    $fp = fopen($cache, 'r');
    if ($fp) {
        $array = unserialize(fread($fp, filesize($cache)));
        return $array;
        unset($array);
    } else {
        httpError(500, "读取栏目缓存文件失败");
    }
}