doudi1449 2011-11-23 15:53
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通过PHP脚本下载文件导致错误/不同的md5校验和 - 为什么?

I'm trying to implement an indirect download through PHP. On the client side I verify if the downloaded file is correct or not using md5.

When I download the file directly (http://server/folder/file.apk) I get the same md5 checksum as on the file system, but when I download it via the PHP script (http://server/some_page.php) I get a totally different checksum. Why?

Here's my PHP script:

<?php
$name_file="test2.apk";
$path="/home/user/public_html/apk/"; 
$dimension_file=(string)filesize($name_file);

header("Content-Type: application/vnd.android.package-archive ; name=".$name_file);
header("Content-Transfer-Encoding: binary");
header("Content-Length: ".$dimension_file);
header("Content-Disposition: inline; filename=".$name_file);
header("Expires: 0");
header("Cache-Control: no-cache, must-revalidate");
header("Cache-Control: private");
header("Pragma: public");

readfile($path.$name_file);
?>
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  • douqiao5552 2011-11-24 20:07
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    I found the error:

     $name_file="test2.apk";
     $path="/home/user/public_html/apk/"; 
     $dimension_file=(string)filesize($name_file); //<-- HERE! --- 
    

    i was retrieving the size using only the name of file instead of using the full path

    filesize($name_file) ---> filesize( $path . $name_file) 
    

    the error was hidden from

    header("Content-Type: application/vnd.android.package-archive"); 
    

    and the php error response added to the content of the downloaded file.

    So i suggest to who has this kind of problems to comment the "Content-Type" while debugging to see if there are some errors in the php code and when all code seems to work re-enable the "Content-Type" header.

    On my server spaces in the code before the

    readfile($path.$name_file);
    

    has no influence on the checksum

    Thanks to Vladimir and Rocket for good practice tips

    本回答被题主选为最佳回答 , 对您是否有帮助呢?
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