对一个cache类的实际应用-php手册-php.cn

cache

Class_Cache.php:

class cache
{

var $cacheDirectory;

var $cacheDuration=3600;

var $cacheFilename;

function cache($cacheDuration=3600,$cacheDirectory='./cache')
{
$this->cacheDuration = 0;
$this->cacheDirectory = '.';
$this->cacheFilename = '';

$this->updateCache($cacheDuration,$cacheDirectory);
}

function getCacheFilename()
{
return $this->cacheFilename;
}

function updateCache($cacheDuration=3600,$cacheFolder='./cache')
{
$this->cacheDuration = $cacheDuration;
$this->cacheDirectory = $cacheFolder;
$this->_makeCacheFolder();
}

function _makeCacheFolder()
{
/*if (!is_dir($this->cacheDirectory))
{
$temp = explode('/',$this->cacheDirectory);
$cur_dir = '';
for($i=0;$i{
$cur_dir .= $temp[$i].'/';

if (!is_dir($cur_dir))
{
if (@mkdir($cur_dir,777)&&($cur_dir!=getcwd()))
{
$this->_writeFile($cur_dir.'.htaccess','Deny from all');
$this->_writeFile($cur_dir.'index.html','');
}
}
}
}*/
if (!is_dir($this->cacheDirectory))
{
$cur_dir=$this->cacheDirectory;
//echo $cur_dir;
if (@mkdir($cur_dir,777))
{
$this->_writeFile($cur_dir.'.htaccess','Deny from all');
$this->_writeFile($cur_dir.'index.html','');
}
}

}

function _writeFile($filename,$contents)
{
if (!file_exists($filename))
{
$fp = @fopen($filename,'w');
if ($fp)
{
fputs($fp,$contents);
fclose($fp);
}
}else{
unlink($filename);
$fp = @fopen($filename,'w');
if ($fp)
{
fputs($fp,$contents);
fclose($fp);
}
}
}

function _setCacheFilename($contents)
{
//$this->cacheFilename = $this->cacheDirectory.'/'.md5($contents).'.txt';

/***********/
global $cache_file;
$this->cacheFilename = $this->cacheDirectory.'/'.$cache_file.'.txt';
/***********/
}
function returnCacheTime()
{
//return "asdfd";
$tim=filemtime($this->cacheFilename);
return date('Y年m月d日 H时i分s秒',$tim);
}
function inCache($contents,$sty='')
{
$this->_setCacheFilename($contents);
if($sty==1)
{
return file_exists($this->cacheFilename);
}else{
if(file_exists($this->cacheFilename))
{
$tim=filemtime($this->cacheFilename);
if((time()-$tim)>$this->cacheDuration)
{
return false;
}else{
return true;
}
}else{
return false;
}
}
}

function readCache()
{
$contents = '';
$fp = @fopen($this->cacheFilename,'r');
if ($fp)
{
while(!feof($fp))
$contents .= fread($fp,4096);
fclose($fp);
}
return $contents;
}

function saveInCache($contents,$filename='')
{
if (trim($filename)=='') $filename = $contents;
if ($this->inCache($filename,1))
{
if((time()-filemtime($this->cacheFilename))>$this->cacheDuration)
{
@unlink($this->cacheFilename);
}
}
$this->_writeFile($this->cacheFilename,$contents);
}

}
?>
cache.php:

require_once("Class_Cache.php");?>

//---------页面缓存----------
$is_cache=1;//是否缓存
$cache_time=300;//缓存时间
if ((strstr($script_name,"/member/") == true) || (strstr($script_name,"/common/") == true))
$is_cache=0;
$cacheDirectory=$_SERVER['DOCUMENT_ROOT']."/cache/";
if($_SERVER['QUERY_STRING']=='')
$cache_file=$_SERVER['PHP_SELF'];
else
$cache_file=$_SERVER['PHP_SELF']."?".$_SERVER['QUERY_STRING'];
if($_SERVER['PHP_SELF']=="/index.php")
$cache_file="___index.php";
$cache_file=preg_replace(array("/\//","/\?/"),array("",""),$cache_file);
//echo $cache_file;

if($is_cache==1)
{
$cache=new cache($cache_time,$cacheDirectory);

if($cache->incache($cache_file))
{
$output=$cache->readcache();
$CacheTime=$cache->returnCacheTime();
unset($cache);
//if( function_exists(return_execute_time()) )
$execute_time=return_execute_time();
$output=str_replace("",$execute_time."
缓存版本：".$CacheTime,$output);
print($output);
exit;
}else
ob_start();

}
function all_cache()
{
global $is_cache;
global $cache_file;
global $cache;
if($is_cache==1)
{
//这里是输出的内容

$output = ob_get_clean();
ob_end_clean();
$cache->saveInCache($output,$cache_file);
$CacheTime=$cache->returnCacheTime();
unset($cache);
//if( function_exists(return_execute_time()) )
$execute_time=return_execute_time();
$output=str_replace("",$execute_time."
缓存版本：".$CacheTime,$output);
print($output);
//exit;
}
}
?>
用法
在页面开头引用

require("cache.php")?>
在页面最后加上

all_cache();?>

实际应用http://www.scmetals.com
class_cache类原贴：http://www.phpx.com/happy/thr83014.html
class_cache.php内容如下

class cache
{

    var $cacheDirectory;

    var $cacheDuration=3600;

    var $cacheFilename;

    function cache($cacheDuration=3600,$cacheDirectory='./cache')
    {
        $this->cacheDuration = 0;
        $this->cacheFilename = '';
        $this->cacheDirectory = '.';
        $this->updateCache($cacheDuration,$cacheDirectory);
    }

    function _makeCacheFolder()
    {
        if (!is_dir($this->cacheDirectory))
        {
            $temp = explode('/',$this->cacheDirectory);
            $cur_dir = '';
            for($i=0;$i            {
                $cur_dir .= $temp[$i].'/';
                if (!is_dir($cur_dir))
                {
                    if (@mkdir($cur_dir,777)&&($cur_dir!=getcwd()))
                    {
                         $this->_writeFile($cur_dir.'.htaccess','Deny from all');
                         $this->_writeFile($cur_dir.'index.html','');
                    }
                }
            }
        }

    }

    function getCacheFilename()
    {
        return $this->cacheFilename;
    }

     function _setCacheFilename($contents)
     {
        $this->cacheFilename = $this->cacheDirectory.'/'.md5($contents).'.txt';
     }

     function inCache($contents,$sty='')
     {
         $this->_setCacheFilename($contents);
        if($sty==1)
         {
            return file_exists($this->cacheFilename);
         }
         else
         {
            if(file_exists($this->cacheFilename))
             {
                $tim=filemtime($this->cacheFilename);
                if((time()-$tim)>$this->cacheDuration)
                 {
                    return false;
                 }
                 else
                 {
                    return true;
                 }
             }
             else
             {
                 return false;
             }
         }
     }

     function readCache()
     {
         $contents = '';
         $fp = @fopen($this->cacheFilename,'r');
        if ($fp)
        {
            while(!feof($fp)) $contents .= fread($fp,4096);
            fclose($fp);
        }
        return $contents;
     }

    function updateCache($cacheDuration=3600,$cacheFolder='./cache')
    {
        $this->cacheDuration = $cacheDuration;
        $this->cacheDirectory = $cacheFolder;
        $this->_makeCacheFolder();
    }

     function saveInCache($contents,$filename='')
     {
            if (trim($filename)=='') $filename = $contents;
            if ($this->inCache($filename,1))
            {
                if((time()-filemtime($this->cacheFilename))>$this->cacheDuration)
                {
                    @unlink($this->cacheFilename);
                }
            }
            $this->_writeFile($this->cacheFilename,$contents);
     }

     function _writeFile($filename,$contents)
     {
         if (!file_exists($filename))
         {
             $fp = @fopen($filename,'w');
             if ($fp)
             {
                fputs($fp,$contents);
                fclose($fp);
             }
         }
        else
         {
            unlink($filename);
            $fp = @fopen($filename,'w');
             if ($fp)
             {
                fputs($fp,$contents);
                fclose($fp);
             }
         }
     }

}
?>