php如何實作快取類別程式碼

php實作快取類別程式碼的方法：【$cache = new Cache(); $values = $cache->get($key); if ($values == false) {$cache-> ;put($key, $values)...】。

本文操作環境：windows10系統、php 7、thinkpad t480電腦。

使用說明：

1、實例化

$cache = new Cache();

2、設定快取時間和快取目錄

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

第一個參數是緩存秒數，第二個參數是快取路徑，根據需要配置。
預設情況下，快取時間是3600 秒，快取目錄是cache/

3、讀取快取

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

4、寫入快取

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

完整實例：

$cache = new Cache();
   
//从缓存从读取键值 $key 的数据
$values = $cache->get($key);
   
//如果没有缓存数据
if ($values == false) {
//insert code here...
//写入键值 $key 的数据
$cache->put($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, &#39;w&#39;);
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&#39;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
}
}
?>

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