php如何實(shí)現(xiàn)緩存類代碼

php實(shí)現(xiàn)緩存類代碼的方法：【$cache = new Cache(); $values = $cache->get($key); if ($values == false) {$cache->put($key, $values)…】。

本文操作環(huán)境：windows10系統(tǒng)、php 7、thinkpad t480電腦。

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 } } ?>

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