简单实用的php缓存函数

/*** @说明: 文件缓存输出* @参数: $cachefile => cache文件(绝对路径)* @参数: $pertime => 缓存输出的间隔时间* @参数: $sql => sql语句* @参数: $templatefile => 模板文件名称(绝对路径)**/function __cache($cachefile,$pertime,$sql,$templatefile) {global $db;if(time() - @filemtime($cachefile) >= $pertime) { $query = $db->query($sql); while($r=$db->fetch($query)) { $cachelist[] = $r; }; include $templatefile.'.php'; $cacheserialize = serialize($cachelist); file_put_contents($cachefile,$cacheserialize);}else{ $cachelist = unserialize(file_get_contents($cachefile)); include $templatefile.'.php';}}