//清空缓存
public function del_cache() { 
//清文件缓存
$dirs = array(APP_PATH.'Runtime/');
@mkdir('Runtime',0777,true);
//清理缓存
foreach($dirs as $value) {
$this->rmdirr($value);
}
$this->success('系统缓存清除成功！', U('index/main'),2);
} 
public function rmdirr($dirname) {
if (!file_exists($dirname)) {
return false;
}
if (is_file($dirname) || is_link($dirname)) {
return unlink($dirname);
}
$dir = dir($dirname);
if($dir){
while (false !== $entry = $dir->read()) {
if ($entry == '.' || $entry == '..') {
continue;
}
//递归
$this->rmdirr($dirname . DIRECTORY_SEPARATOR . $entry);
}
}
$dir->close();
return rmdir($dirname);
}

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