php的缓存类 |
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来源:互联网 作者:未知 发布时间:2008-01-13 |
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php的缓存类
以下为引用的内容:
<?php /* * FileName : cache.inc.php * Link : [url]http://blog.csdn.net/dxflingxing/[/url] www~phperz~com * Author : dxflingxing * Date : 2006-5-9 * Last Modified : 2006-5-16 * Version : 1.0.1 * Description : Cache a page in file formart www.phperz.com * Notice : Make sure you cache file dir can be readed and wrote * * Thanks to : 小邪,barryonline(寒) ************************************************************ * * Usage : * # Cache active time half an hour * # This Can Auotmatic make some none exist dirs phperz~com * # Or you can use an cache file in curent dir * # The Usage Such as * # $cache = new cache(string cache_name,int seconds); * * require ('cache.inc.php'); * $cache = new cache('dir1/dir2/cache_name.htm',60*30); * * $cache->start(); * * # Your Page Contents With print php程序员站 * phpinfo(); * * $cache->_end(); * */ class cache { var $_file; var $cache_time; function cache($_file='_index.htm',$cache_time=1) { www~phperz~com $this->_file = $_file; $this->cache_time = $cache_time; } /* * Start cache method without Return */ phperz.com function start() { if($this->cache_is_active()) { include($this->_file); exit; } ob_start(); phperz.com } /* * End of cache method without Return */ function _end() { $this->make_cache(); ob_end_flush(); } /* phperz.com * Check if cache file is actived * Return true/false */ function cache_is_active() { if ($this->cache_is_exist()) { if (time() - $this->lastModified() < $this->cache_time) php程序员站 Return true; else { Return false; } } else { Return false; www~phperz~com } } /* * Create cache file * Return true/false */ function make_cache() { $content = $this->get_cache_content(); if($this->write_file($content)) { phperz.com Return true; } else { Return false; } } /* * Check if cache file is exists * Return true/false */ www.phperz.com function cache_is_exist() { if(file_exists($this->_file)) { Return true; } else { Return false; www.phperz.com } } /* * Return last Modified time in bollin formart * Usage: $lastmodified = $this->lastModified(); */ function lastModified() { Return @filemtime($this->_file); } php程序员站 /* * Return Content of Page * Usage: $content = $this->get_cache_content(); */ function get_cache_content() { $contents = ob_get_contents(); // Return '<!--'.date('Y-m-d H:i:s').'-->'.$contents; Return $contents; php程序员之家 } /*Write content to $this->_file * Return true/false * Usage: $this->write_file($content); **/ function write_file($content,$mode='w+') { $this->mk_dir($this->_file); phperz.com if (!$fp = @fopen($this->_file,$mode)) { $this->report_Error($this->_file." 目录或者文件属性无法写入."); Return false; php程序员站 } else{ @fwrite($fp,$content); @fclose($fp); @umask($oldmask); Return true; php程序员站 } } /* * Make given dir included in $this->_file * Without Return * Usage: $this->mk_dir(); */ function mk_dir() { //$this->_file = str_replace('','/'); $dir = @explode("/", $this->_file); php程序员之家 $num = @count($dir)-1; $tmp = './'; for($i=0; $i<$num; $i++){ www.phperz.com $tmp .= $dir[$i]; if(!file_exists($tmp)){ @mkdir($tmp); @chmod($tmp, 0777); phperz.com } $tmp .= '/'; } } /* * Unlink an exists cache * Return true/false * Usage: $this->clear_cache(); */ function clear_cache() { php程序员之家 if (!@unlink($this->_file)) { $this->report_Error('Unable to remove cache'); Return false; } else { phperz.com Return true; } } /* * Report Error Messages * Usage: $this->report_Error($message); */ function report_Error($message=NULL) { if($message!=NULL) { www.phperz.com trigger_error($message); } } } ?>
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