Another cache class-PHP Tutorial-php.cn

Another cache class

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Release： 2016-07-25 09:11:15

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Cache class

/*
* Cache class cache
* Author: Duo Noob
* Creation time: 2006-05-05
* Example:
include( "cache.php" );
$cache = new cache(30);
$cache->cacheCheck();
echo date("Y-m-d H:i:s");
$cache->caching();
*/
class cache {
// Cache directory
var $cacheRoot = "./cache/";
//Cache update time in seconds, 0 means no caching
var $cacheLimitTime = 0;
//Cache file name
var $cacheFileName = "";
/ /Cache extension
var $cacheFileExt = "php";
/*
* constructor
* int $cacheLimitTime cache update time
*/
function cache( $cacheLimitTime ) {
if( intval( $cacheLimitTime ) )
$ this->cacheLimitTime = $cacheLimitTime;
$this->cacheFileName = $this->getCacheFileName();
ob_start();
}
/*
* Check whether the cache file is within the set update time
* Return: If it is within the update time, return the file content, otherwise it will return failure
*/
function cacheCheck(){
if( file_exists( $this->cacheFileName ) ) {
$cTime = $this->getFileCreateTime ( $this->cacheFileName );
if( $cTime + $this->cacheLimitTime > time() ) {
echo file_get_contents( $this->cacheFileName );
ob_end_flush();
exit;
}
}
return false;
}
/*
* Cache files or output static
* string $staticFileName static file name (including relative path)
*/
function caching( $staticFileName = "" ){
if( $this ->cacheFileName ) {
$cacheContent = ob_get_contents();
//echo $cacheContent;
ob_end_flush();
if( $staticFileName ) {
$this->saveFile( $staticFileName, $cacheContent );
}
if( $this->cacheLimitTime )
$this->saveFile( $this->cacheFileName, $cacheContent );
}
}
/*
* Clear cache files
* string $fileName specified file name (including functions) or all (all)
* Return: true if clearing is successful, otherwise false
*/
function clearCache( $fileName = "all" ) {
if( $fileName != "all" ) {
$fileName = $this->cacheRoot . strtoupper(md5($fileName)).".".$this->cacheFileExt;
if( file_exists( $fileName ) ) {
return @unlink( $fileName );
}else return false;
}
if ( is_dir( $this->cacheRoot ) ) {
if ( $dir = @opendir( $this->cacheRoot ) ) {
while ( $file = @readdir( $dir ) ) {
$check = is_dir( $file );
if ( !$check )
@unlink( $this->cacheRoot . $file );
}
@closedir( $dir );
return true;
}else{
return false;
}
}else{
return false;
}
}
/*
* Generate a cache file name based on the current dynamic file
*/
function getCacheFileName() {
return $this-> cacheRoot . strtoupper(md5($_SERVER["REQUEST_URI"])).".".$this->cacheFileExt;
}
/*
* Cache file creation time
* string $fileName cache file name (including relative path) )
* Return: file generation time in seconds, if the file does not exist, return 0
*/
function getFileCreateTime( $fileName ) {
if( ! trim($fileName) ) return 0;
if( file_exists( $fileName ) ) {
return intval(filemtime( $fileName ));
}else return 0;
}
/*
* Save the file
* string $fileName file name (including relative path)
* string $text file content
* Return: Returns true on success, false on failure
*/
function saveFile($fileName, $text) {
if( ! $fileName || ! $text ) return false;
if( $this->makeDir( dirname( $ fileName ) ) ) {
if( $fp = fopen( $fileName, "w" ) ) {
if( @fwrite( $fp, $text ) ) {
fclose($fp);
return true;
}else {
fclose($fp);
return false;
}
}
}
return false;
}
/*
* Continuously create directories
* string $dir directory string
* int $mode permission number
* return : Return true if created successfully or all have been built, otherwise return false
*/
function makeDir( $dir, $mode = "0777" ) {
if( ! $dir ) return 0;
$dir = str_replace( "\ ", "/", $dir );
$mdir = "";
foreach( explode( "/", $dir ) as $val ) {
$mdir .= $val."/";
if( $val == ".." || $val == "." || trim( $val ) == "" ) continue;
if( ! file_exists( $mdir ) ) {
if(!@mkdir( $mdir, $mode )){
return false;
}
}
}
return true;
}
}
?>

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