php文件下载

function getTmp(){
    $file_name = ‘orderTemp.xlsx‘;
    $file_path = dirname(__FILE__);
    #判断文件是否存在
    if(! file_exists($file_path. ‘/‘ .$file_name)){
        echo "file not exists";
        return;
    }
    #存在的话，只读方式打开
    $fp = fopen($file_name,"r");
    #获取文件大小
    $file_size = filesize($file_name);
    #让下载的文件名是中文
    $file_name = iconv(‘UTF-8‘, ‘gbk‘, ‘订单表格模板.xlsx‘);
    #设置头
    header("Content-Type: application/octet-stream");
    header("Accept-Ranges: bytes");
    header("Accept-Length: $file_size");
    header("Content-Disposition: attachment; filename=" . $file_name);
    #设定一次读取的字节数
    $buffer = 1024;
    #存储文件到本地
    while(! feof($fp)){
        $file_data = fread($fp,$buffer);
        echo $file_data;
    }
    fclose($fp);
}