php的缓存类 - 百家拳原创软件教程网

<?php

class cache {
   var $_file;
   var $cache_time;

   function cache($_file='_index.htm',$cache_time=1) {
   $this->_file = $_file;
   $this->cache_time = $cache_time;
   }

   /*
   * Start cache method without Return
   */
   function start() {

   if($this->cache_is_active()) {
   include($this->_file);
   exit;
   }
   ob_start();
   }

   /*
   * End of cache method without Return
   */
   function _end() {
   $this->make_cache();
   ob_end_flush();
   }

   /*
   * 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)
   Return true;
   else {
   Return false;
   }
   }
   else {
   Return false;
   }
   }

   /*
   * Create cache file
   * Return true/false
   */
   function make_cache() {
   $content = $this->get_cache_content();
   if($this->write_file($content)) {
   Return true;
   }
   else {
   Return false;
   }
   }

   /*
   * Check if cache file is exists
   * Return true/false
   */
   function cache_is_exist() {
   if(file_exists($this->_file)) {
   Return true;
   }
   else {
   Return false;
   }
   }

   /*
   * Return last Modified time in bollin formart
   * Usage: $lastmodified = $this->lastModified();
   */
   function lastModified() {
   Return @filemtime($this->_file);
   }

   /*
   * Return Content of Page
   * Usage: $content = $this->get_cache_content();
   */
   function get_cache_content() {
   $contents = ob_get_contents();
// Return ''.$contents;
   Return $contents;
   }

   /*Write content to $this->_file
   * Return true/false
   * Usage: $this->write_file($content);
   **/
   function write_file($content,$mode='w+')
   {
   $this->mk_dir($this->_file);
   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;
   } else{
   @fwrite($fp,$content);
   @fclose($fp);
   @umask($oldmask);
   Return true;
   }
   }

   /*
   * Make given dir included in $this->_file
   * Without Return
   * Usage: $this->mk_dir();
   */
   function mk_dir()
   { //$this->_file = str_replace('','/');
   $dir = @explode("/", $this->_file);
   $num = @count($dir)-1;
   $tmp = './';
   for($i=0; $i<$num; $i++){
   $tmp .= $dir[$i];
   if(!file_exists($tmp)){
   @mkdir($tmp);
   @chmod($tmp, 0777);
   }
   $tmp .= '/';
   }
   }

   /*
   * Unlink an exists cache
   * Return true/false
   * Usage: $this->clear_cache();
   */
   function clear_cache() {
   if (!@unlink($this->_file)) {
   $this->report_Error('Unable to remove cache');
   Return false;
   }
   else {
   Return true;
   }
   }

   /*
   * Report Error Messages
   * Usage: $this->report_Error($message);
   */
   function report_Error($message=NULL) {
   if($message!=NULL) {
   trigger_error($message);
   }
   }
}
?>