A PHP caching class code (with detailed description)_PHP tutorial

Copy code The code is as follows:

define('CACHE_ROOT', dirname(__FILE__).'/cache '); //Cache storage directory
define('CACHE_TIME', 1800); //Cache time unit seconds
define('CACHE_FIX','.html');
$CacheName=md5($ _SERVER['REQUEST_URI']).CACHE_FIX; //Cache file name
$CacheDir=CACHE_ROOT.'/'.substr($CacheName,0,1);//Cache file storage directory
$CacheUrl=$ CacheDir.'/'.$CacheName;//The full path of the cached file
//The cache is only cached when requested in GET mode. After POST, you generally want to see the latest results
if($_SERVER['REQUEST_METHOD']= ='GET'){
//If the cache file exists and has not expired, read it out.
if(file_exists($CacheName) && time()-filemtime($CacheName)$fp=fopen($CacheName,'rb');
fpassthru($fp);
fclose($fp);
exit;
}
//Determine whether the folder exists, create it if it does not exist
elseif(!file_exists($CacheDir)){
if (!file_exists(CACHE_ROOT)){
mkdir(CACHE_ROOT,0777);
chmod(CACHE_ROOT,0777);
}
mkdir($CacheDir,0777);
chmod($CacheDir ,0777);
}
//Callback function, this function is automatically called when the program ends
function AutoCache($contents){
global $CacheUrl;
$fp=fopen($ CacheUrl,'wb');
fwrite($fp,$contents);
fclose($fp);
chmod($CacheUrl,0777);
//While generating a new cache, Automatically delete all old caches to save space and can be ignored.
//DelOldCache();
return $contents;
}
function DelOldCache(){
chdir(CACHE_ROOT);
foreach (glob("*/*".CACHE_FIX ) as $file){
if(time()-filemtime($file)>CACHE_TIME)unlink($file);
}
}
//Callback function auto_cache
ob_start ('AutoCache');
}else{
//Delete the cache file if it is not a GET request.
if(file_exists($CacheUrl))unlink($CacheUrl);
}
?>

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