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关于php文件缓存类的用法分析

不言原创: 2018-06-15 16:15:461020浏览

这篇文章主要介绍了php文件缓存类用法,以实例形式较为详细的分析了php文件缓存类的定义、功能及具体使用技巧,非常具有实用价值,需要的朋友可以参考下

本文实例讲述了php文件缓存类用法。分享给大家供大家参考。具体如下：

<?php
/**
 * 简单的文件缓存类
 *
 */
class XZCache{
 // default cache time one hour
 var $cache_time = 3600;
 // default cache dir
 var $cache_dir = &#39;./cache&#39;;
 public function __construct($cache_dir=null, $cache_time=null){
  $this->cache_dir = isset($cache_dir) ? $cache_dir : $this->cache_dir;
  $this->cache_time = isset($cache_time) ? $cache_time : $this->cache_time;
 }
 public function saveCache ($key, $value){
  if (is_dir($this->cache_dir)){
   $cache_file = $this->cache_dir . &#39;/xzcache_&#39; . md5($key);
   $timedif = @(time() - filemtime($cache_file));
   if ($timedif >= $this->cache_time) {
    // cached file is too old, create new
    $serialized = serialize($value);
    if ($f = @fopen($cache_file, &#39;w&#39;)) {
     fwrite ($f, $serialized, strlen($serialized));
     fclose($f);
    }
   }
   $result = 1;
  }else{
   echo "Error:dir is not exist.";
   $result = 0;
  }
  return $result;
 }
 /**
  * @return array 
  *   0 no cache
  *    1 cached
  *    2 overdue
  */
 public function getCache ($key) {
  $cache_file = $this->cache_dir . &#39;/xzcache_&#39; . md5($key);
  if (is_dir($this->cache_dir) && is_file($cache_file)) {
   $timedif = @(time() - filemtime($cache_file));
   if ($timedif >= $this->cache_time) {
    $result[&#39;cached&#39;] = 2;
   }else{
    // cached file is fresh enough, return cached array
    $result[&#39;value&#39;] = unserialize(file_get_contents($cache_file));
    $result[&#39;cached&#39;] = 1;
   }
  }else {
   echo "Error:no cache";
   $result[&#39;cached&#39;] = 0;
  }
  return $result;
 }
} //end of class

用法示例如下：

$cache = new XZCache();
$key = &#39;global&#39;;
$value = $GLOBALS;
$cache->saveCache($key, $value);
$result = $cache->getCache($key);
var_dump($result);

以上就是本文的全部内容，希望对大家的学习有所帮助，更多相关内容请关注PHP中文网！

关于php文件缓存类的用法分析

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