史上最簡單方便的PHP緩存類代碼

2012/5/9 14:53:43  出處：本站整理   人氣：99次    字號：小  中  大

大家都知道網(wǎng)上關(guān)于 PHP 緩存類的資料灰常多，不過這類算是目前我見過的既能滿足需求，但又無比簡潔的一個(gè)。好了，不跟大家廢話了，咱們直接看代碼吧！

使用說明：

1、實(shí)例化

$cache = new Cache();

2、設(shè)置緩存時(shí)間和緩存目錄

$cache = new Cache(60, '/any_other_path/');

第一個(gè)參數(shù)是緩存秒數(shù)，第二個(gè)參數(shù)是緩存路徑，根據(jù)需要配置。
默認(rèn)情況下，緩存時(shí)間是 3600 秒，緩存目錄是 cache/

3、讀取緩存

$value = $cache->get('data_key');

4、寫入緩存

$value = $cache->put('data_key', 'data_value');

完整實(shí)例：

$cache = new Cache();

//從緩存從讀取鍵值 $key 的數(shù)據(jù)
$values = $cache->get($key);

//如果沒有緩存數(shù)據(jù)
if ($values == false) {
//insert code here...
//寫入鍵值 $key 的數(shù)據(jù)
$cache->put($key, $values);
} else {
//insert code here...
}

Cache.class.php

<?php
class Cache {
private $cache_path;//path for the cache
private $cache_expire;//seconds that the cache expires

//cache constructor, optional expiring time and cache path
public function Cache($exp_time=3600,$path="cache/"){
$this->cache_expire=$exp_time;
$this->cache_path=$path;
}

//returns the filename for the cache
private function fileName($key){
return $this->cache_path.md5($key);
}

//creates new cache files with the given data, $key== name of the cache, data the info/values to store
public function put($key, $data){
$values = serialize($data);
$filename = $this->fileName($key);
$file = fopen($filename, 'w');
if ($file){//able to create the file
fwrite($file, $values);
fclose($file);
}
else return false;
}

//returns cache for the given key
public function get($key){
$filename = $this->fileName($key);
if (!file_exists($filename) || !is_readable($filename)){//can't read the cache
return false;
}
if ( time() < (filemtime($filename) + $this->cache_expire) ) {//cache for the key not expired
$file = fopen($filename, "r");// read data file
if ($file){//able to open the file
$data = fread($file, filesize($filename));
fclose($file);
return unserialize($data);//return the values
}
else return false;
}
else return false;//was expired you need to create new
}
}
?>