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使用方法：
Memcached
<div class="codetitle"><a style="CURSOR: pointer" data="41350" class="copybut" id="copybut41350" onclick="doCopy('code41350')"> 代码如下:<div class="codebody" id="code41350">
$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
<div class="codetitle"><a style="CURSOR: pointer" data="33064" class="copybut" id="copybut33064" onclick="doCopy('code33064')"> 代码如下:<div class="codebody" id="code33064">
$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,$data,600);
}
下载: class_cache3.php
<div class="codetitle"><a style="CURSOR: pointer" data="11038" class="copybut" id="copybut11038" onclick="doCopy('code11038')"> 代码如下:<div class="codebody" id="code11038">
<?php abstract class Cache_Abstract {
abstract function fetch($key);
abstract function store($key,$ttl);
abstract function delete($key);
} class Cache_APC extends Cache_Abstract { function fetch($key) {
return apc_fetch($key);
} function store($key,$ttl) {
return apc_store($key,$ttl);
} function delete($key) {
return apc_delete($key);
} } class Cache_MemCache extends Cache_Abstract {
public $connection; function __construct() {
$this->connection = new MemCache;
} function store($key,$ttl) {
return $this->connection->set($key,$ttl);
} function fetch($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($key,$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);
} }
?>
（编辑：李大同）
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