Create CAPTCHA Protection with PHP and AJAX

0

CAPTCHA is a simple test to determine if a user is a computer or a human. It is used to prevent spam abuse on the websites. So if you use CAPTCHA on your web site forms, this can help in stopping some bots and making life harder for other bots in accessing or using your forms.In brief the CAPTCHA protection works by generating a random string, writing it to an image, then storing the string inside of a session or by some other method. This is then checked when the form is submitted.
We need 4 files, name:
ajax_captcha.js // This file process ajax post for form.
captcha.php // This will check if captcha submited is valid or not
create_image.php // This file will creat an image from session string
index.php // This is demo file, will show a captcha image and form to test

Demo: PHP AJAX CAPTCHA

So, here we go:
1, ajax_captcha.js

2, captcha.php

3, create_image.php

4, index.php

Download: http://yyen.info/rRjMrLlFZB

Create CAPTCHA Protection with PHP and AJAX
5 - 1191 vote[s]

Other Posts you may be interested in:

  1. Liên Khúc Trung Thu 2014 – Vanh LEG
  2. PHP Images Hosting Script
  3. Chọn tuổi kết hôn – chọn chồng/vợ hợp tuổi
  4. Thử rượu
  5. Đêm Buồn Tỉnh Lẻ – HD Karaoke
  6. Fixed Menu When Scrolling & Fixed Navigation Menu Bar
  7. PHP – Chỉ cho chạy trên 1 domain
Cập nhật lúc: 15:30:50 PM, 9th September 2014

Comments

Leave A Reply