winzip icon

Image Verification (updated)

Email
Submitted on: 1/1/2015 12:42:00 PM
By: Dracarys (from psc cd)  
Level: Intermediate
User Rating: By 14 Users
Compatibility: PHP 4.0
Views: 4452
 
     This tutorial will show you how to make an image verification like they use (used?) on Yahoo or they still do on Planet Source Code. It is quite useful in order to prevent users from writing scripts that would do the voting, posting or whatever. Now, whenever a user wants to vote for something, he gets an image with a randomly generated string, that consists of uppercase and lowercase characters and numbers from 0 to 9. He then has to enter the string he sees on the picture and only if the code is correct, he will be allowed to proceed. I hope this code will help you. I admit, i took the idea from a recent post on Planet Source Code. (canīt remember, who it was) But the method used was too unsecure and relied on posting variables. :)

 
winzip iconDownload code

Note: Due to the size or complexity of this submission, the author has submitted it as a .zip file to shorten your download time. Afterdownloading it, you will need a program like Winzip to decompress it.Virus note:All files are scanned once-a-day by Planet Source Code for viruses, but new viruses come out every day, so no prevention program can catch 100% of them. For your own safety, please:
  1. Re-scan downloaded files using your personal virus checker before using it.
  2. NEVER, EVER run compiled files (.exe's, .ocx's, .dll's etc.)--only run source code.

If you don't have a virus scanner, you can get one at many places on the net including:McAfee.com


Report Bad Submission
Use this form to tell us if this entry should be deleted (i.e contains no code, is a virus, etc.).
This submission should be removed because:

Your Vote

What do you think of this code (in the Intermediate category)?
(The code with your highest vote will win this month's coding contest!)
Excellent  Good  Average  Below Average  Poor (See voting log ...)
 

Other User Comments


 There are no comments on this submission.
 

Add Your Feedback
Your feedback will be posted below and an email sent to the author. Please remember that the author was kind enough to share this with you, so any criticisms must be stated politely, or they will be deleted. (For feedback not related to this particular code, please click here instead.)
 

To post feedback, first please login.