php处理缓存类

时间：2015-02-22 10:01:56 　来源：免费模板网　作者：风雪　阅读次数　tagsphp处理缓存类

要加快网站访问速度需要用到缓存，下面提供一个生成缓存的文件给大家参考

<?php
 
class cacheDB {

public $cachefile = 'dbcache/';
	public $cachetime = 60;
	public $cachefiletype = 'php';
	public $caching = true;

if (is_array($cachecontent)) {
			if (count($cachecontent) == 0) return false;

$content = var_export($cachecontent, TRUE);
		}else {
			if (empty($content)) return false;
			$content = "'" . $cachecontent . "'";
		}

$filename = $this->cachefile . $cachefilename . '_' . md5($cachefilename) . '.' . $this->cachefiletype;
		if ($renewid || !is_file($filename)) {

$sConfig = "<?php\n";
			$sConfig = $sConfig . '/*uptime:' . date('Y-m-d H:i:s', time()) . "*/\n";
			$sConfig = $sConfig . '$' . $cachefilename . '=' . $content . ";\n";
			$sConfig = $sConfig . '?' . '>';

$cachefilename = $cachefilename . '_' . md5($cachefilename);

$this->cachefilewrite($cachefilename, $sConfig);
		} else {
			include ($filename);
			$cachecontent = $$cachefilename;
		}
		return $cachecontent;
	}
	/**
	 * 检查缓存
	 * @param $cachekey  缓存键值
	 * @param bool $checkid  true表示启用缓存时间，false不启用缓存时间永久有效
	 */
	function checkcache($cachekey, $checkid=true) {
		if (!$this->caching) return false;
		if (empty($cachekey)) return false;

$cachefilename = $this->cachefile . $cachekey . '_' . md5($cachekey) . '.' . $this->cachefiletype;
		if (is_file($cachefilename)) {
			if ($checkid) {
				$nowtime = time();
				$filetime = filemtime($cachefilename);
				$endtime = $filetime + $this->cachetime;
				$exchchefiletime = $nowtime - $endtime;
			} else {
				$exchchefiletime = -1;
			}
			if ($exchchefiletime >= 0) {
				return false;
			} else {
				include ($cachefilename);
				return $$cachekey;
			}
		} else {
			return false;
		}
	}
	/**
	 * 删除缓存
	 * @param $cachekey
	 * @param $cachekeyseach
	 */
	function clearcache($cachekey=false, $cachekeyseach=false) {
		if (!$this->caching) return false;
		if ($cachekey) {
			if (!$cachekeyseach) {

$cachefilename = $this->cachefile . $cachekey . '_' . md5($cachekey) . '.' . $this->cachefiletype;
				if (is_file($cachefilename)) {

@unlink($cachefilename);
					return true;
				} else {
					return false;
				}
			} else {

$cachefilename = $this->cachefile;
				if (file_exists($cachefilename)) {

$dirname = @opendir($cachefilename);
					while ($val = @readdir($dirname)) {
						if ($val == '.' || $val == '..') continue;

if (stripos('@#!@@' . $val, $cachekey) == 5) {
							$value = $cachefilename . $val;

@unlink($value);
						}
					}
					@closedir($dirname);
					return true;
				} else {
					return false;
				}
			}
		} else {

$cachefilename = $this->cachefile;
			if (file_exists($cachefilename)) {

$dirname = @opendir($cachefilename);
				while ($val = @readdir($dirname)) {
					if ($val == '.' || $val == '..') continue;
					$value = $cachefilename . $val;
					@unlink($value);
				}
				@closedir($dirname);
				return true;
			}else {
				return false;
			}
		}
	}

}
?>

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