php 抽象缓存类
require_once dirname(__FILE__)."/../Model/Iface/Icache.php";
abstract class AllCache implements Icache
{
static $cache_dir;
const CACHETIME=60;//缓存的时间是 60 秒
static $_data;
static $_interce;
//构造函数
public function __construct()
{
$cache_dirname = dirname(__FILE__)."/../Cache";
if([email protected]_dir($cache_dirname))
{
if([email protected]($cache_dirname,0777))
{
self::msgbox('缓存文件不存在而且不能创建,需要手动创建.');
return false;
}
}
self::$cache_dir = $cache_dirname;
}
/**
* 静态调用
* self 指类本身
*/
public static function getInstance()
{
if(! (self::$_interce instanceof self)){
self::$_interce = new self();
}
return self::$_interce;
}
//输出异常
private function msgbox($errorstring)
{
echo "发生错误:".$errorstring."
";
}
//设定缓存文件
private function cache_page($pageurl,$pagedata)
{
if(!$fso=fopen($pageurl,'w')){
self::msgboxs('无法打开缓存文件.');//trigger_error
return false;
}
if(!flock($fso,LOCK_EX)){//LOCK_NB,排它型锁定
self::msgboxs('无法锁定缓存文件.');//trigger_error
return false;
}
if(!fwrite($fso,$pagedata)){//写入字节流,serialize写入其他格式
self::msgboxs('无法写入缓存文件.');//trigger_error
return false;
}
flock($fso,LOCK_UN);//释放锁定
fclose($fso);
return true;
}
//读取文件状态
private function isOpenCache($cacheFile)
{
if(!file_exists($cacheFile)){
self::msgbox('无法读取缓存文件.');exit;
}
/*echo '读取缓存文件:'.$cacheFile;
return unserialize(file_get_contents($cacheFile));
$fso = fopen($cacheFile, 'r');
$data = fread($fso, filesize($cacheFile));
fclose($fso);
return $data;*/
}
/**
* 格式化数据
*/
private function setFileContent($data)
{
$html = " $html .="\$data= ".var_export($data, true).";\n";
$html .="?>";
return $html;
}
/**
* 设置缓存数据
* @param $cacheFile 缓存文件名
× @param $_data 缓存数据源
*/
public function readData($cacheFile='default_cache.txt',$_data)
{
$_data = self::SetFileContent($_data);
$cacheFile = self::$cache_dir."/".$cacheFile;
if(file_exists($cacheFile))
{
self::isOpenCache($cacheFile);
if(filemtime($cacheFile) {
self::cache_page($cacheFile,$_data);
}
}else{
self::cache_page($cacheFile,$_data);
}
require_once($cacheFile);
self::$_data = $data;
}
/**
* 获取数据
*/
public function GetData()
{
return self::$_data;
}
}
/*
AllCache::readData("cache_news.php",array(0,1,2,3,5,6));
print_r(AllCache::GetData());
*/
?>

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PHPapplicationscanbeoptimizedforspeedandefficiencyby:1)enablingopcacheinphp.ini,2)usingpreparedstatementswithPDOfordatabasequeries,3)replacingloopswitharray_filterandarray_mapfordataprocessing,4)configuringNginxasareverseproxy,5)implementingcachingwi

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