php实现文件下载时出现乱码

Question

实现文件下载是通过在一个resource.php点击之后响应userdownfile.php实现的。
其中实现文件下载的方法是： 
function download_by_path($path_name){
         ob_end_clean();
         $hfile = fopen($path_name, "rb") or die("Can not find file: $path_name\n");
         Header("Content-type: application/octet-stream");
         Header("Content-Transfer-Encoding: binary");
         Header("Accept-Ranges: bytes");
         Header("Content-Length: ".filesize($path_name));
         Header("Content-Disposition: attachment; filename=\"$path_name\"");
         while (!feof($hfile)) {

            echo fread($hfile, 1024);
         }
         fclose($hfile);
    }页面提供下载的按钮是：
<form name="form" action="userDownmsg.php" method="post">
<input type="hidden" name="count" value="1" />
   <input type="submit" name="download" value="downlaod"/>&nbsp;&nbsp;&nbsp;<?php echo $fileArray[1];?>
</form>我怀疑是不是提供下载功能的PHP文件某个方法出错了才导致出现乱码。
PHP文件的函数：
function getIP()
{
    static $realip;
    if (isset($_SERVER)){
        if (isset($_SERVER["HTTP_X_FORWARDED_FOR"])){
            $realip = $_SERVER["HTTP_X_FORWARDED_FOR"];
        } else if (isset($_SERVER["HTTP_CLIENT_IP"])) {
            $realip = $_SERVER["HTTP_CLIENT_IP"];
        } else {
            $realip = $_SERVER["REMOTE_ADDR"];
        }
    } else {
        if (getenv("HTTP_X_FORWARDED_FOR")){
            $realip = getenv("HTTP_X_FORWARDED_FOR");
        } else if (getenv("HTTP_CLIENT_IP")) {
            $realip = getenv("HTTP_CLIENT_IP");
        } else {
            $realip = getenv("REMOTE_ADDR");
        }
    }
    return $realip;
}
 
function getCity($ip = '')
{
    if($ip == ''){
        $url = "http://int.dpool.sina.com.cn/iplookup/iplookup.php?format=json";
        $ip=json_decode(file_get_contents($url),true);
        $data = $ip;
    }else{
        $url="http://ip.taobao.com/service/getIpInfo.php?ip=".$ip;
        $ip=json_decode(file_get_contents($url));   
        if((string)$ip->code=='1'){
           return false;
        }
        $data = (array)$ip->data;
    }
    
    return $data;   
}
$address=" ";
$ip=getIP();
$City1=getCity(getIP());
$City2=getCity();
if($City1!=false){
$address=$City1['country']."  ".$City1['country_id']."  ".$City1['area']."  ".$City1['area_id']."  ".$City1['region']."  ".$City1['region_id'].
"  ".$City1['city']."  ".$City1['city_id']."  ".$City1['isp']."  ".$City1['isp_id']."\r\n";
}else{
$address=$City2['country']."  ".$City2['province']."  ".$City2['city']."  ".$City2['district']."  ".$City2['isp']."  ".$City2['type']."  ".$City2['desc'].$ip."\r\n"; }


$date=getTime();
//$ip = $_SERVER["REMOTE_ADDR"];
$userMsg= $ip;
$browse=getbrowseMsg();

$filename=getfilename();
$contentA=$filename."  ".$date."\r\n".$userMsg."\r\n".$browse.$address."\r\n";
$compile_dir = "./downfile.txt"; 
$file = fopen($compile_dir,"a"); 
fwrite($file,$contentA); 
fclose($file);
乱码是这样出现的，点击下载之后浏览器加载了很久，然后跳转到提供文件下载的PHP文件，文件显示了一堆乱码。GIF89a,一堆黑色的菱形里面有问号然后一堆@@

Answer 1

你很多代码与下载无关，先不理首先把下面代码保存为download.php$path_name = '文件路径'; // 这里可以先写死
download_by_path($path_name);
function download_by_path($path_name){
         ob_end_clean();
         $hfile = fopen($path_name, "rb") or die("Can not find file: $path_name\n");
         Header("Content-type: application/octet-stream");
         Header("Content-Transfer-Encoding: binary");
         Header("Accept-Ranges: bytes");
         Header("Content-Length: ".filesize($path_name));
         Header("Content-Disposition: attachment; filename=\"$path_name\"");
         while (!feof($hfile)) {            echo fread($hfile, 1024);
         }
         fclose($hfile);
    }
然后访问download.php 看看是否可以下载。

Answer 2

看你的图片，应该下载时没有设置header导致。