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标题: php缓存类 [打印本页]

作者: superadmin 时间: 2007-12-12 19:03
标题: php缓存类
<?
/*
程序设计：林建炫(飘枫设计室)
made in 陆丰 by 2007-03-03 中午
QQ: 5818500
Email: linzhenxuan@163.com
尊重他人也尊重自己！请勿删除该版权信息
如果你使用、修改请保留该信息！
类名称：缓存使用类
用途：全局变量、模版
不足地方：性能没内存共享快！
*/
Class Cls_cache
{
var $dir='cache';//缓存目录
var $auto = true;//是否自动删除过时缓寸,如果缓存文件大、多不建议这样做
var $file_list;//文件名
var $dir_name;//目录绝对路径;
var $code = "<?php exit;?>";//加入的代码
var $cache_time = "3600";//缓存时间,默认1小时
Function __construct()
{
//class start;
//建立目录
$dir = $this->dir;
$dir = explode("/",$dir);
foreach($dir as $a)
{
if($i==0)
{
$temp .= $a;
}
else
{
$temp .= "/".$a;
}
if(!is_dir($temp))
{
mkdir($temp);
};
$i++;
}
//自动清除过期缓存文件
if($this->auto==true){$this->auto();}
//读取目录文件
$this->read_file();
}
Function read_file()
{//得到格式 fil1|fil2|fil3|fil4....
$dir_name = realpath($this->dir);
$this->dir_name = $dir_name;
$dir = opendir($dir_name);//打开目录
while ($file_name = readdir($dir))
{
if(($file_name!=".")&&($file_name!=".."))
{
$file_list .=$file_name."|";
}
}
$file_list = substr($file_list,0,(strlen($file_list)-1));
closedir($dir);
$this->file_list = $file_list;
return $file_list;
}
Function read($strname)
{//read('index.php?page=1');
$strname = md5(trim($strname));
$list = $this->file_list;
$re = "/(".$strname.")_([0-9]*)_([0-9]*)[a-zA-Z0-9\.]*/i";
if(preg_match($re,$list,$match))
{//找到文件
$file = $this->dir_name."\\".$match[0];
if($match[2]>$match[3]){unlink($file);return false;}
$content = file_get_contents($file);
$content = substr($content,strlen($this->code),(strlen($content)-strlen($this->code)));
return $content;
}
}
Function write($strname,$content,$cache_time='')
{
$strname = md5(trim($strname));
$list = $this->file_list;
$time = explode(" ",microtime());
$time = $time[1];
if(!$cache_time){$cache_time = $this->cache_time;}
$cache_time += $time;
$re = "/(".$strname.")_([0-9]*)_([0-9]*)[a-zA-Z0-9\.]*/i";
if(preg_match($re,$list,$match))
{//找到文件
$re_file = $this->dir_name."\\".$strname."_".$time."_".$cache_time.".php";
$file = $this->dir_name."\\".$match[0];
rename($file,$re_file);
$content = $this->code.$content;
$content = file_put_contents($re_file,$content);
$this->read_file();
return true;
}
else
{
$file = $this->dir_name."\\".$strname."_".$time."_".$cache_time.".php";
$content = $this->code.$content;
file_put_contents($file,$content);
$this->read_file();
}
}
Function delete($strname)
{
$strname = md5(trim($strname));
$list = $this->file_list;
$re = "/(".$strname.")_([0-9]*)_([0-9]*)[a-zA-Z0-9\.]*/i";
if(preg_match($re,$list,$match))
{//找到文件
$file = $this->dir_name."\\".$match[0];
unlink($file);
$this->read_file();
return true;
}else{return false;}
}
Function auto()
{//功能自动清除过期缓存文件
$list = $this->read_file();
$re = "/([a-zA-Z0-9]*)_([0-9]*)_([0-9]*)[a-zA-Z0-9\.]*/i";
if(preg_match_all($re,$list,$match))
{
for($i=0;$i<=(count($match[0])-1);$i++)
{
$file = $this->dir_name."\\".$match[0][$i];
if($match[2][$i]>$match[3][$i]){@unlink($file);$this->read_file();}
}
}
}
}
//测试代码
$cache = New Cls_cache;
$list = $cache->file_list;
//$cache->write('content','我是最好的哈哈');
echo $cache->read('content');
?>
这是我刚完成的缓存类！准备用在论坛的缓存！

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