Update Zip files in yii

Update Zip Files Using PHP

I added the source code to add new file into existing zip files.
SourceCode:

public function actionUpdatezip($zipfilename,$filelist){
     $destination=Yii::app()->basePath.'/files/'.$zipfilename.".zip";   
     $zip=new ZipArchive();
     if(!$zip->open($destination)) {
             return false;
     }  
     if($filelist) 
     {                    
         foreach($filelist as $thefile)
         {                        
         $filemodel=new Filesmodle;   
         $randno=rand(11111,99999);                                        
         $filename=$randno.$thefile->name;   // yii magic method   
         $zip->addFile($thefile->tempname,$filename);                       
         //$fileext=$thefile->extensionName;
         //$filemodel->Size=$thefile->size;                                            
         }
      }
      $zip->close();    
}