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 create a image with  a random string displayed on it.  Then the user ask 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 ia easiest way to protect web form from spammers.

     

Captcha.php

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

     
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