[php] view plaincopy
'./cache/',
//缓存时间
'cachetime'=>20,
//cache type
'cachetype'=>1,
//扩展名
'cacheexe'=>'.php'
);
$cache = new cache($cache_set);
$a=array('1','2');
$a=aaa;
$b='';
if($cache->cache_is(d)){
$c=$cache->cache_read(d);
echo c;
print_r($c);
}else {
$b=$cache->cache_data('d',$a);
}
print_r($b);
//$cache->clear(a);
//echo $cache->cache_read(./cache/d.php);
//echo $d;
*/
/**
* 数据缓存类 v1.0
* @author shooke
* 2009-11-13 16:02:26
* 用于缓存数据,如变量,但不能缓存页面
*/
class cache{
//配置
public $config = array(
//缓存路径
'cacheroot'=>'./cache/',
//缓存时间
'cachetime'=>1,
//cache 类型 1串化数据 2变量
'cachetype'=>2,
//扩展名
'cacheexe'=>'.php'
//转换中间变量
);
public $return_name=array();
function __construct($cache_set = array())
{
if(!empty($cache_set)) $this->config=array_merge($this->config,$cache_set);
$this->config['classname'] = __class__;
}
public function clear($filename=''){
if (file_exists($this->cache_file($filename))) {
@unlink($this->cache_file($filename));
}elseif (empty($filename)){
$this->clear_dir($this->config['cacheroot']);
}else{
$this->clear_dir($this->config['cacheroot'].$filename);
echo $this->config['cacheroot'].$filename;
}
}
//循环删除路径
private function clear_dir($dir,$to = false)
{
if ($list = glob($dir.'/*'))
{
foreach ($list as $file)
{
is_dir($file) ? $this->clear_dir($file) : unlink($file);
}
}
if ($to === false) rmdir($dir);
}
//写入缓存
private function cache_write($filename, $writetext, $openmod='w'){
if (!file_exists($filename)) {
@$this->makedir( dirname($filename ));
}
if(@$fp = fopen($filename, $openmod)) {
flock($fp, 2);
fwrite($fp, $writetext);
fclose($fp);
return true;
} else {
echo file: $filename write error.;
return false;
}
}
//缓存有效期 有效返回 true
public function cache_is($filename){
$filename=$this->cache_file($filename);
if( file_exists( $filename ) ) {
//如果缓存时间为负数则永不过期
if ($this->config['cachetime']
return true;
}
//如果缓存时间为0则一直过期
if ($this->config['cachetime'] == 0) {
return false;
}
//获取缓存文件的建立时间
$ctime = intval(filemtime( $filename ));
//比较是否大于缓存时间,是则过期 否则不过期
if (time() - $ctime > $this->config['cachetime']) {
return false;
}else {
return true;
}
//文件不存在视为过期失效
}else {
return false;
}
}
public function cache_data($name,$data){
$varname=$name;
$name = $this->cache_file($name);
//config['cachetime']==0也就是不启用缓存是直接返回数据
if ($this->config['cachetime'] 0) {
if($this->config['cachetype']==1){
$write_data = .serialize($data);
//return $data;
}else {
$write_data = ;
}
$this->cache_write($name,$write_data);
}
return $data;
}
//缓存文件名
private function cache_file($filename){
return $this->config['cacheroot'].$filename.$this->config['cacheexe'];
}
//读取文件
public function cache_read($file){
$file=$this->cache_file($file);
if (!file_exists($file)) {
return '';
}
if($this->config['cachetype']==1){
if (function_exists('file_get_contents')){
$cache_content= file_get_contents($file);
}else{
$fopen = fopen($file,'r');
$cache_content = '';
do {
$data = fread($fopen,filesize($file));
if (strlen($data)===0) break;
$cache_content .= $data;
}while(1);
fclose($fopen);
}
$cache_content = substr($cache_content,13);/* 去除 */
$cache_content = unserialize($cache_content);
return $cache_content;
}else{
include_once($file);
return $var;
}
}
//循环创建目录
private 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(!@mkdir( $mdir, $mode )){
return false;
}
}
}
return true;
}
}
?>