PHP文件页面缓存类
在php中缓存分类数据库缓存,文件缓存和内存缓存,下面我来给各位同学详细介绍PHP文件缓存类实现代码,有需要了解的朋友可参考.
一个不错的PHP文件页面缓存类代码如下:
- <?php
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- class cache {
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- var $cacheRoot = "./cache/";
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- var $cacheLimitTime = 3;
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- var $cacheFileName = "";
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- var $cacheFileExt = "php";
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- function cache( $cacheLimitTime ) {
- if( intval( $cacheLimitTime ) )
- $this->cacheLimitTime = $cacheLimitTime;
- $this->cacheFileName = $this->getCacheFileName();
- ob_start();
- }
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- 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;
- }
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- function caching( $staticFileName = "" ){
- if( $this->cacheFileName ) {
- $cacheContent = ob_get_contents();
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- ob_end_flush();
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- if( $staticFileName ) {
- $this->saveFile( $staticFileName, $cacheContent );
- }
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- if( $this->cacheLimitTime )
- $this->saveFile( $this->cacheFileName, $cacheContent );
- }
- }
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- 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;
- }
- }
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- function getCacheFileName() {
- return $this->cacheRoot . strtoupper(md5($_SERVER["REQUEST_URI"])).".".$this->cacheFileExt;
- }
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- function getFileCreateTime( $fileName ) {
- if( ! trim($fileName) ) return 0;
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- if( file_exists( $fileName ) ) {
- return intval(filemtime( $fileName ));
- }else return 0;
- }
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- function saveFile($fileName, $text) {
- if( ! $fileName || ! $text ) return false;
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- 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;
- }
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- function makeDir( $dir, $mode = "0777" ) {
- if( ! $dir ) return 0;
- $dir = str_replace( "\", "/", $dir );
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- $mdir = "";
- foreach( explode( "/", $dir ) as $val ) {
- $mdir .= $val."/";
- if( $val == ".." || $val == "." || trim( $val ) == "" ) continue;
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- if( ! file_exists( $mdir ) ) {
- if(!@mkdir( $mdir, $mode )){
- return false;
- }
- }
- }
- return true;
- }
- }
- ?>
上面使用算是页面缓存了,每次访问页面的时候,都会先检测相应的缓存页面文件是否存在,如果不存在,就连接数据库,得到数据,显示页面并同时生成缓存页面文件,这样下次访问的时候页面文件就发挥作用了,模板引擎和网上常见的一些缓存类通常有此功能.
给大家介绍一个Memcache缓存了,算是内存缓存了,代码如下:
- <?php
- $memcache = new Memcache;
- $memcache->connect('localhost', 11211) or die ("Could not connect");
- $version = $memcache->getVersion();
- echo "Server's version: ".$version."n";
- $tmp_object = new stdClass;
- $tmp_object->str_attr = 'test';
- $tmp_object->int_attr = 123;
- $memcache->set('key', $tmp_object, false, 10) or die ("Failed to save data at the server");
- echo "Store data in the cache (data will expire in 10 seconds)n";
- $get_result = $memcache->get('key');
- echo "Data from the cache:n";
- var_dump($get_result);
- ?>
Memcached是高性能的,分布式的内存对象缓存系统,用于在动态应用中减少数据库负载,提升访问速度.