几个简单的php数据文件缓存类
数据文件缓存的做法我们常用的有php文件缓存与利用memcache来缓存数据,下面面我分别总结了memcache缓存数据与数据文件缓存有需要的朋友可参考参考.
1.对于一般的变量,把该变量变成php语言的格式,写到文件中,用时只要include这个文件就相当于加载了cache了.
2.对于array型的变量,把array转化为php语言定义array的字符串,写到文件中,用时也只要include就相当于加载了cache了.
3.缓存cache时间上的控制,通过获取缓存文件的创建时间和现在的时间进行对比,如果没有到更新时间,直接读取缓存,如果到了更新时间,查询数据库.
文件缓存类,代码如下:
- <?php
- class DataCache
- {
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- private function arrayEval($array, $arrayName = '', $level = 0)
- {
- $space = str_repeat("t", $level);
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- if (emptyempty($arrayName))
- {
- $evaluate = "arrayn$space(n";
- }
- else
- {
- $evaluate = "${$arrayName} = arrayn$space(n";
- }
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- $space2 = str_repeat("t", $level + 1);
- $comma = $space2;
- if (!emptyempty($array))
- {
- foreach ($array as $key => $val)
- {
- $key = is_string($key) ? ''' . addcslashes($key, ''\') . ''' : $key;
- $val = !is_array($val) && (!preg_match('/^-?[1-9]d*$/', $val) || strlen($val) > 12) ? ''' . addcslashes($val, ''\') . ''' : $val;
- if (is_array($val))
- {
- $evaluate .= "$comma$key => " . arrayEval($val, '', $level + 1);
- }
- else
- {
- $evaluate .= "$comma$key => $val";
- }
- $comma = ",n$space2";
- }
- }
- $evaluate .= "n$space)";
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- if ($level == 0)
- {
- $evaluate .= ";";
- }
- return $evaluate;
- }
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- public static function writeCache($path, $arrayName, $data)
- {
- if ($handle = fopen($path, 'w+'))
- {
- $data = self::arrayEval($data, $arrayName);
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- $dataConvert = "<?phpn" . $data;
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- flock($handle, LOCK_EX);
- $rs = fputs($handle, $dataConvert);
- flock($handle, LOCK_UN);
- fclose($handle);
- if ($rs !== false)
- {
- return true;
- }
- }
- return false;
- }
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- }
- ?>
调用方法,代码如下:
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- DataCache::writeCache($filePath, $arrayName, $data);
memcache来缓存数据,提供这个文件缓存的类m希望大家可以看看,代码如下:
- <?php
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- class Cache_FileCache{
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- public static function setCache($key,$data,$cacheLife)
- {
- if(file_exists(__SITE_FILE_CACHE))
- {
- @$file = __SITE_FILE_CACHE . "/" . $key .".php";
- $cache = array();
- $time = __SYS_TIME;
- $cache['content'] = $data;
- $cache['expire'] = $cacheLife === 0 ? 0 : $time+$cacheLife;
- $cache['mtime'] = $time;
- $cache = serialize($cache);
- $setReslut = @file_put_contents($file,$cache) or self::error(__line__,"文件写入出错");
- $chmodReslut = @chmod($file,0777) or self::error(__line__,"设定文件权限失败");
- if($setReslut && $chmodReslut)
- {
- return true;
- }
- else
- {
- return false;
- }
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- }
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- }
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- public static function getCache($key)
- {
- @$file = __SITE_FILE_CACHE . "/" . $key .".php";
- if(file_exists($file))
- {
- $data = @file_get_contents($file);
- $data = unserialize($data);
- if($data['expire']==0 || $data['expire'] > __SYS_TIME)
- {
- return $data['content'];
- }
- else
- {
- unlink($file);
- return array();
- }
- }
- }
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- public static function delCache($key)
- {
- if (@unlink(__SITE_FILE_CACHE."/".$key.".php"))
- {
- return true;
- }
- else
- {
- return false;
- }
- }
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- public static function clearAllCache()
- {
- $files = scandir(__SITE_FILE_CACHE);
- foreach ($files as $val)
- {
- @unlink(__SITE_FILE_CACHE."/".$val);
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- }
- }
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- public static function error($line,$msg)
- {
- die("出错文件:".__file__."/n出错行:$line/n错误信息:$msg");
- }
- }
-
- ?>