PHP网站制作之一个对照蛋疼的php缓存类 - 仓酷云

<?phpfinalclassFileCache{/*****缓存目次***@varstring*/privatestatic$msCachePath=null;/*****默许缓存生效工夫(1小时)***@varint*/constmiEXPIRE=3600;/*****机关 *self::$msCachePath缓存目次为共享目次***@paramstring$sCachePath*/function__construct($sCachePath=./tmp/){if(is_null(self::$msCachePath))self::$msCachePath=$sCachePath;}/*****读取缓存 *前往:缓存内容,字符串或数组；缓存为空或过时前往null***@paramstring$sKey缓存键值(无需做md5())**@returnstringnull**@accesspublic*/publicfunctionget($sKey){if(empty($sKey))returnfalse;$sFile=self::getFileName($sKey);if(!file_exists($sFile))returnnull;else{$handle=fopen($sFile,rb);if(intval(fgets($handle))>time()){//反省工夫戳{ //未生效期，掏出数据$sData=fread($handle,filesize($sFile));fclose($handle);returnunserialize($sData);}else{//已生效期fclose($handle);returnnull;}}}/***写进缓存****@paramstring$sKey缓存键值**@parammixed$mVal必要保留的工具**@paramint$iExpire生效工夫**@returnbool*@accesspublic*/publicfunctionset($sKey,$mVal,$iExpire=null){if(empty($sKey))returnfalse;$sFile=self::getFileName($sKey);if(!file_exists(dirname($sFile)))if(!self::is_mkdir(dirname($sFile)))returnfalse;$aBuf=array();$aBuf[]=time()+((empty($iExpire))?self::miEXPIRE:intval($iExpire));$aBuf[]=serialize($mVal);/***写进文件操纵*/$handle=fopen($sFile,wb);fwrite($handle,implode("
",$aBuf));fclose($handle);returntrue;}/*****删除指定的缓存键值***@paramstring$sKey缓存键值*@returnbool*/publicfunctiondel($sKey){if(empty($sKey))returnfalse;else{@unlink(self::getFileName($sKey));returntrue;}}/*****猎取缓存文件全路径 *前往:缓存文件全路径 *$sKey的值会被转换成md5(),并分化为3级目次举行会见***@paramstring$sKey缓存键**@returnstring*@accessprotected*/privatestaticfunctiongetFileName($sKey){if(empty($sKey))returnfalse;$key_md5=md5($sKey);/***$aFileName=array();*$aFileName[]=rtrim(self::$msCachePath,/);*$aFileName[]=$key_md5{0}.$key_md5{1};*$aFileName[]=$key_md5{2}.$key_md5{3};*$aFileName[]=$key_md5{4}.$key_md5{5};*$aFileName[]=$key_md5;*/returnself::$msCachePath./.$key_md5;//returnimplode(/,$aFileName);}/*****创立目次 ****@paramstring$sDir*@returnbool*/privatestaticfunctionis_mkdir($sDir=){if(empty($sDir))returnfalse;/***假如没法创立缓存目次，让体系间接抛堕落误提醒*/echo$sDir;if(!mkdir($sDir,0666))returnfalse;elsereturntrue;}}

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