为什么md5为两个不同的文件名返回相同的哈希值

Question

I have two video file having different file names.But when I md5 filenames both are returning same hashes. Below are the file names.

1. \\test\\downloadvideo\\ans-70055040.hd.mp4

2. \\test\\downloadvideo\\ans-70055298.hd.mp4

$this->_video_md5 = md5_file("\test\downloadvideo\ans-70055040.hd.mp4");
$this->_videoo_md51 = md5_file("\test\downloadvideo\ans-70055298.hd.mp4");

echo "md5".$this->_video_md5

will return md551f767588587184d13b8c9e6ed550166sh190d2078270d4ea1cb570b1de7 fb890bc761bda9a

echo "md5".$this->_videoo_md51 

will return md551f767588587184d13b8c9e6ed550166sh190d2078270d4ea1cb570b1de7 fb890bc761bda9a

How can I get two different md5 hashes for the file names.

Answer 1

As written above, md5|sha1_file return the hash of the file contents, not including the file's name.

A possible "solution" would be to hash the outcome of both the filename and the hash of the file itself, which will be a unique hash again.

Answer 2

Use md5("\\test\\downloadvideo\\ans-70055298.hd.mp4"); instead of md5_file, if you want to hash the filename, not the contents of the file.

Answer 3

To get different hashes, change the contents of the files, so the files are not identical.

If you want to check the filenames only , use md5("filename") and not md5_file("filename")

Also you don't seem to have quotes around the filename. They should be there! And escape backslashes!

So

md5_file(\test\downloadvideo\ans-70055298.hd.mp4);

should be

md5_file("\\test\\downloadvideo\\ans-70055298.hd.mp4");

otherwise, \\t ist interpreted as a tab character . Due to that, your md5_file get's an invalid filename both times, thus returning the same hash.