PHP caching tool class to implement web page caching
Aug 08, 2016 am 09:22 AM
php caching tool class implements web page caching
When the php program resists large traffic access, dynamic websites are often difficult to withstand, so a caching mechanism must be introduced. Generally, there are two types of cache
1. File caching
2 , Data query result caching, using memory to implement caching
This example mainly uses file caching.
The main principle is to use the cache function to store the web page display results. If it is called again within the specified time, the cache file can be loaded.
Tool code:
// 文件緩存類
class Cache {
/**
* $dir : 緩存文件存放目錄
* $lifetime : 緩存文件有效期,單位為秒
* $cacheid : 緩存文件路徑,包含文件名
* $ext : 緩存文件擴(kuò)展名(可以不用),這里使用是為了查看文件方便
*/
private $dir;
private $lifetime;
private $cacheid;
private $ext;
/**
* 析構(gòu)函數(shù),檢查緩存目錄是否有效,默認(rèn)賦值
*/
function __construct($dir = '', $lifetime = 1800) {
if ($this->dir_isvalid ( $dir )) {
$this->dir = $dir;
$this->lifetime = $lifetime;
$this->ext = '.Php';
$this->cacheid = $this->getcacheid ();
}
}
/**
* 檢查緩存是否有效
*/
private function isvalid() {
if (! file_exists ( $this->cacheid ))
return false;
if (! (@$mtime = filemtime ( $this->cacheid )))
return false;
if (mktime () - $mtime > $this->lifetime)
return false;
return true;
}
/**
* 寫入緩存
* $mode == 0 , 以瀏覽器緩存的方式取得頁面內(nèi)容
* $mode == 1 , 以直接賦值(通過$content參數(shù)接收)的方式取得頁面內(nèi)容
* $mode == 2 , 以本地讀取(fopen ile_get_contents)的方式取得頁面內(nèi)容(似乎這種方式?jīng)]什么必要)
*/
public function write($mode = 0, $content = '') {
switch ($mode) {
case 0 :
$content = ob_get_contents ();
break;
default :
break;
}
ob_end_flush ();
try {
file_put_contents ( $this->cacheid, $content );
} catch ( Exception $e ) {
$this->error ( '寫入緩存失敗!請檢查目錄權(quán)限!' );
}
}
/**
* 加載緩存
* exit() 載入緩存后終止原頁面程序的執(zhí)行,緩存無效則運(yùn)行原頁面程序生成緩存
* ob_start() 開啟瀏覽器緩存用于在頁面結(jié)尾處取得頁面內(nèi)容
*/
public function load() {
if ($this->isvalid ()) {
// 以下兩種方式,哪種方式好?????
require_once ($this->cacheid);
echo "<!--緩存-->";
// echo file_get_contents($this->cacheid);
exit ();
} else {
ob_start ();
}
}
/**
* 清除緩存
*/
public function clean() {
try {
unlink ( $this->cacheid );
} catch ( Exception $e ) {
$this->error ( '清除緩存文件失敗!請檢查目錄權(quán)限!' );
}
}
/**
* 取得緩存文件路徑
*/
private function getcacheid() {
return $this->dir . md5 ( $this->geturl () ) . $this->ext;
}
/**
* 檢查目錄是否存在或是否可創(chuàng)建
*/
private function dir_isvalid($dir) {
if (is_dir ( $dir ))
return true;
try {
mkdir ( $dir, 0777 );
} catch ( Exception $e ) {
$this->error ( '所設(shè)定緩存目錄不存在并且創(chuàng)建失敗!請檢查目錄權(quán)限!' );
return false;
}
return true;
}
/**
* 取得當(dāng)前頁面完整url
*/
private function geturl() {
$url = '';
if (isset ( $_SERVER ['REQUEST_URI'] )) {
$url = $_SERVER ['REQUEST_URI'];
} else {
$url = $_SERVER ['Php_SELF'];
$url .= empty ( $_SERVER ['QUERY_STRING'] ) ? '' : '?' . $_SERVER ['QUERY_STRING'];
}
return $url;
}
/**
* 輸出錯(cuò)誤信息
*/
private function error($str) {
echo '<div>' . $str . '</div>';
}
}
How to use:
The usage is as follows:
Put part of the code in front of the logic code to be cached:
$cachedir = './Cache/'; // 設(shè)定緩存目錄 $cache = new Cache ( $cachedir, 33 ); // 省略參數(shù)即采用缺省設(shè)置, $cache = new Cache($cachedir); if (@$_GET ['cacheact'] != 'rewrite' || @$_GET ['clearCache'] == 'ok') // 此處為一技巧,通過xx.Php?cacheact=rewrite更新緩存,以此類推,還可以設(shè)定一些其它操作 $cache->load (); // 裝載緩存,緩存有效則不執(zhí)行以下頁面代碼 // 頁面代碼開始
Part of it is placed after the logic code to be cached:
// 頁面代碼結(jié)束 $cache->write (); // 首次運(yùn)行或緩存過期,生成緩存
Original address: http://sijienet.com/bbs/?leibie=showinfo&id=50
The above introduces the PHP caching tool class to implement web page caching, including aspects of the content. I hope it will be helpful to friends who are interested in PHP tutorials.
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