PHP Memcached + APC + 文件缓存封装的简单示例

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使用方法：
Memcached

代码如下:

 
$cache = new Cache_MemCache(); 
$cache->addServer('www1'); 
$cache->addServer('www2',11211,20); // this server has double the memory, and gets double the weight 
$cache->addServer('www3',11211); 
// Store some data in the cache for 10 minutes 
$cache->store('my_key','foobar',600); 
// Get it out of the cache again 
echo($cache->fetch('my_key')); 

文件缓存

代码如下:

 
$cache = new Cache_File(); 
$key = 'getUsers:selectAll'; 
// check if the data is not in the cache already 
if (!$data = $cache->fetch($key)) { 
// assuming there is a database connection 
$result = mysql_query("SELECT * FROM users"); 
$data = array(); 
// fetching all the data and putting it in an array 
while($row = mysql_fetch_assoc($result)) { $data[] = $row; } 
// Storing the data in the cache for 10 minutes 
$cache->store($key,$data,600); 
} 

下载: class_cache3.php

代码如下:

<?php 

abstract class Cache_Abstract { 
abstract function fetch($key); 
abstract function store($key, $data, $ttl); 
abstract function delete($key); 
} 

class Cache_APC extends Cache_Abstract { 

function fetch($key) { 
return apc_fetch($key); 
} 

function store($key, $data, $ttl) { 
return apc_store($key, $data, $ttl); 
} 

function delete($key) { 
return apc_delete($key); 
} 

} 

class Cache_MemCache extends Cache_Abstract { 
public $connection; 

function __construct() { 
$this->connection = new MemCache; 
} 

function store($key, $data, $ttl) { 
return $this->connection->set($key, $data, 0, $ttl); 
} 

function fetch($key) { 
return $this->connection->get($key); 
} 

function delete($key) { 
return $this->connection->delete($key); 
} 

function addServer($host, $port = 11211, $weight = 10) { 
$this->connection->addServer($host, $port, true, $weight); 
} 

} 

class Cache_File extends Cache_Abstract { 

function store($key, $data, $ttl) { 
$h = fopen($this->getFileName($key), 'a+'); 
if (!$h) 
throw new Exception('Could not write to cache'); 
flock($h, LOCK_EX); 
fseek($h, 0); 
ftruncate($h, 0); 
$data = serialize(array(time() + $ttl, $data)); 
if (fwrite($h, $data) === false) { 
throw new Exception('Could not write to cache'); 
} 
fclose($h); 
} 

function fetch($key) { 
$filename = $this->getFileName($key); 
if (!file_exists($filename)) 
return false; 
$h = fopen($filename, 'r'); 
if (!$h) 
return false; 
flock($h, LOCK_SH); 
$data = file_get_contents($filename); 
fclose($h); 
$data = @ unserialize($data); 
if (!$data) { 
unlink($filename); 
return false; 
} 
if (time() > $data[0]) { 
unlink($filename); 
return false; 
} 
return $data[1]; 
} 

function delete($key) { 
$filename = $this->getFileName($key); 
if (file_exists($filename)) { 
return unlink($filename); 
} 
else { 
return false; 
} 
} 

private function getFileName($key) { 
return '/tmp/s_cache' . md5($key); 
} 

} 
?>

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