------cache-------------------------- // 从缓存中读取，避免重复从数据库取数据 function data_read_cache($tid) { global $conf; $key = 'website_data_' . $tid; static $cache = array(); // 用静态变量只能在当前 request 生命周期缓存，要跨进程，可以再加一层缓存： memcached/xcache/apc/ if (isset($cache[$key])) return $cache[$key]; if ('mysql' == $conf['cache']['type']) { $r = data_read($tid); } else { $r = cache_get($key); if (NULL === $r) { $r = data_read($tid); $r and cache_set($key, $r, 1800); // 30分钟 } } $cache[$key] = $r ? $r : NULL; return $cache[$key]; } ?>
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