2PHP缓存种

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Release: 2016-06-13 11:00:29
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2PHP缓存类

<?php /** 缓存类 cache* 作    者:多菜鸟* 联系邮箱:kingerq AT msn DOT com* 创建时间:2006-05-05* 实    例:include( "cache.php" ); $cache = new cache(30);$cache->cacheCheck();echo date("Y-m-d H:i:s");//$cache->clearCache('mv_moves.php');$cache->caching();*/class cache {  //缓存目录  var $cacheRoot        = "./cache/";  //缓存更新时间秒数,0为不缓存  var $cacheLimitTime   = 0;  //缓存文件名  var $cacheFileName    = "";  //缓存扩展名  var $cacheFileExt     = "php";   /*   * 构造函数   * int $cacheLimitTime 缓存更新时间   */  function cache( $cacheLimitTime ) {    if( intval( $cacheLimitTime ) )      $this->cacheLimitTime = $cacheLimitTime;    $this->cacheFileName = $this->getCacheFileName();    ob_start();  }   /*   * 检查缓存文件是否在设置更新时间之内   * 返回:如果在更新时间之内则返回文件内容,反之则返回失败   */  function cacheCheck(){    if( file_exists( $this->cacheFileName ) ) {      $cTime = $this->getFileCreateTime( $this->cacheFileName );      if( $cTime + $this->cacheLimitTime > time() ) {        echo file_get_contents( $this->cacheFileName );        ob_end_flush();        exit;      }    }    return false;  }   /*   * 缓存文件或者输出静态   * string $staticFileName 静态文件名(含相对路径)   */  function caching( $staticFileName = "" ){    if( $this->cacheFileName ) {      $cacheContent = ob_get_contents();      //echo $cacheContent;      ob_end_flush();       if( $staticFileName ) {          $this->saveFile( $staticFileName, $cacheContent );      }       if( $this->cacheLimitTime )        $this->saveFile( $this->cacheFileName, $cacheContent );    }  }   /*   * 清除缓存文件   * string $fileName 指定文件名(含函数)或者all(全部)   * 返回:清除成功返回true,反之返回false   */  function clearCache( $fileName = "all" ) {    if( $fileName != "all" ) {      $fileName = $this->cacheRoot . strtoupper(md5($fileName)).".".$this->cacheFileExt;      if( file_exists( $fileName ) ) {        return @unlink( $fileName );      }else return false;    }    if ( is_dir( $this->cacheRoot ) ) {      if ( $dir = @opendir( $this->cacheRoot ) ) {        while ( $file = @readdir( $dir ) ) {          $check = is_dir( $file );          if ( !$check )          @unlink( $this->cacheRoot . $file );        }        @closedir( $dir );        return true;      }else{        return false;      }    }else{      return false;    }  }   /*   * 根据当前动态文件生成缓存文件名   */  function getCacheFileName() {    return  $this->cacheRoot . strtoupper(md5($_SERVER["REQUEST_URI"])).".".$this->cacheFileExt;  }   /*   * 缓存文件建立时间   * string $fileName   缓存文件名(含相对路径)   * 返回:文件生成时间秒数,文件不存在返回0   */  function getFileCreateTime( $fileName ) {    if( ! trim($fileName) ) return 0;     if( file_exists( $fileName ) ) {      return intval(filemtime( $fileName ));    }else return 0;  }   /*   * 保存文件   * string $fileName  文件名(含相对路径)   * string $text      文件内容   * 返回:成功返回ture,失败返回false   */  function saveFile($fileName, $text) {    if( ! $fileName || ! $text ) return false;     if( $this->makeDir( dirname( $fileName ) ) ) {      if( $fp = fopen( $fileName, "w" ) ) {        if( @fwrite( $fp, $text ) ) {          fclose($fp);          return true;        }else {          fclose($fp);          return false;        }      }    }    return false;  }   /*   * 连续建目录   * string $dir 目录字符串   * int $mode   权限数字   * 返回:顺利创建或者全部已建返回true,其它方式返回false   */  function makeDir( $dir, $mode = "0777" ) {    if( ! $dir ) return 0;    $dir = str_replace( "\\", "/", $dir );        $mdir = "";    foreach( explode( "/", $dir ) as $val ) {      $mdir .= $val."/";      if( $val == ".." || $val == "." || trim( $val ) == "" ) continue;            if( ! file_exists( $mdir ) ) {        if([email protected]( $mdir, $mode )){         return false;        }      }    }    return true;  }}?>
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