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Homephp教程php手册PHP文件缓存内容保存格式实例分析

这篇文章主要介绍了PHP文件缓存内容保存格式,是PHP程序开发中非常实用的功能,需要的朋友可以参考下

本文实例讲述了PHP文件缓存内容保存格式,,对于进行PHP项目开发非常具有实用价值。分享给大家供大家参考借鉴。具体分析如下:

1、PHP文件缓存内容保存格式

PHP文件缓存内容保存格式主要有三种:

(1)变量 var_export 格式化成PHP正常的赋值书写格式;
(2)变量 serialize 序列化之后保存,用的时候反序列化;
(3)变量 json_encode格式化之后保存,用的时候json_decode

互联网上测试结果是:serialize格式的文件解析效率大于Json,Json的解析效率大于PHP正常赋值。
所以我们要是缓存数据建议采用序列化的形式解析数据会更快。

2、PHP文件缓存的简单案例

_cache_path = $config['cache_path']; } else { $this->_cache_path = realpath(dirname(__FILE__) . "/") . "/cache/"; } } //判断key值对应的文件是否存在,如果存在,读取value值,value以序列化存储 public function get($id) { if (!file_exists($this->_cache_path . $id)) { return FALSE; } $data = @file_get_contents($this->_cache_path . $id); $data = unserialize($data); if (!is_array($data) || !isset($data['time']) || !isset($data['ttl'])) { return FALSE; } if ($data['ttl'] > 0 && time() > $data['time'] + $data['ttl']) { @unlink($this->_cache_path . $id); return FALSE; } return $data['data']; } //设置缓存信息,根据key值,生成相应的缓存文件 public function set($id, $data, $ttl = 60) { $contents = array( 'time' => time() , 'ttl' => $ttl, 'data' => $data ); if (@file_put_contents($this->_cache_path . $id, serialize($contents))) { @chmod($this->_cache_path . $id, 0777); return TRUE; } return FALSE; } //根据key值,删除缓存文件 public function delete($id) { return @unlink($this->_cache_path . $id); } public function clean() { $dh = @opendir($this->_cache_path); if (!$dh) return FALSE; while ($file = @readdir($dh)) { if ($file == "." || $file == "..") continue; $path = $this->_cache_path . "/" . $file; if (is_file($path)) @unlink($path); } @closedir($dh); return TRUE; } }

希望本文所述PHP缓存实例对大家的PHP程序开发能起到一定的帮助借鉴作用。

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