文件下载

//读取文件夹下的文件并删除
//简单的查看文件夹下的文件
    public function read(){
        $dir="data/";
        $file=scandir($dir);
        //array_splice($file,2,1);
        if(count($file)>17){
            unlink($dir.$file[2]);
        }
        
    }
//文件下载
    function downfile(){
        $file_name = input("name"); 
        $file_path = "data/".$file_name;  
        $buffer = 102400;
        if (!file_exists($file_path)) {  
            echo "<script type='text/javascript'> alert('对不起！该文件不存在或已被删除！'); </script>";  
      
            return;  
        }  
        //return $file_path;
        $fp = fopen($file_path, "r");  
        $file_size = filesize($file_path);  
        $file_data = '';  
        while (!feof($fp)) {  
            $file_data .= fread($fp, $buffer);  
        }  
        fclose($fp);  

        header("Pragma: public");  
        header("Expires: 0");  
        header("Cache-Control: must-revalidate, post-check=0, pre-check=0");  
        header("Cache-Control: public");  
        header("Content-Description: File Transfer");  
        header("Content-type:application/octet-stream;");  
        header("Accept-Ranges:bytes");  
        header("Accept-Length:{$file_size}");  
        header("Content-Disposition:attachment; filename={$file_name}");  
        header("Content-Transfer-Encoding: binary");  
        echo $file_data;  
    }