Captcha Image Verification


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Captcha is a good way to avoid automatic form submission.In this tutorial, I explains about captcha image verification. It creates an image with a random string displayed on it.  Then the user asks to fill the string in the form filed and once form submitted it checks if the string on image matches the input by the user. This is the easiest way to protect web form from spammers.

This file create an image with random string displayed on it.

This script genrate a random number from 10000 to 99999 and assign it to a session variable $_SESSION[“vercode”]. then it generate a image 25*65 px with balck background and font size 14px. Now create a web form .

Now create php script for submitting the form

This code check the verfication code input by user matches with sring given on image. if the code mataches then the form data submit else error message shows

Download Source Code(Captcha Image Verification)
Size: 2.07 KB
Version: V 1.0

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