Community Learn Tools Library Leisure
search
English
Home > Backend Development > PHP Tutorial > body text

How does the website determine whether the data is duplicate when uploading it?

WBOY
Release： 2016-07-25 08:59:32
Original
978 people have browsed it
①For example, on a library website, how to prevent users from repeatedly uploading the same documents? Should MD5 be used for comparison? Is there any other way?
② If you only change the name of the document without changing the content, will the MD5 be the same before and after the change?


Related labels：
上传资料时网站怎么判断是否是重复资料 ？
source：php.cn
Previous article：Detailed explanation of php cookie operations (setting, use, deletion) Next article：An example of code to obtain cpu and memory usage in php
Statement of this Website
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn
Latest Articles by Author
Latest Issues
function_exists() cannot determine the custom function Function test () {return true;} if (function_exists ('test')) {echo "test is function...
From 2024-04-29 11:01:01
0
2
1901
How to display the mobile version of Google Chrome Hello teacher, how can I change Google Chrome into a mobile version?
From 2024-04-23 00:22:19
0
10
2071
The child window operates the parent window, but the output does not respond. The first two sentences are executable, but the last sentence cannot be implemented.
From 2024-04-19 15:37:47
0
1
1742
There is no output in the parent window document.onclick = function(){ window.opener.document.write('I am the output of the child ...
From 2024-04-18 23:52:34
0
1
1647
Where is the courseware about CSS mind mapping? Courseware
From 2024-04-16 10:10:18
0
0
1656
Related Topics
More>
Popular Recommendations
Popular Tutorials
More>
Related Tutorials
Popular Recommendations
Latest courses
Latest Downloads
More>
Web Effects
Website Source Code
Website Materials
Front End Template