post link : http://www.skptricks.com/2017/12/captcha-code-php-jquery-ajax.html

In this tutorial we are going to share some idea about "Google reCAPTCHA". Google has been introduced reCAPTCHA API called Are you a robot? This protects your website for spammers and robots. You can easily integrate the google reCAPTCHA API in you website.
What is the main purpose of using Captcha?

The technology is used mostly to block spammers and bots that try to automatically harvest email addresses or try to automatically sign up for or make use of Web sites, blogs or forums. CAPTCHA, whose users include Yahoo and Google, blocks automated systems, which can't read the distorted letters in the graphic.

Now we will discuss about reCAPTCHA V2 , which helps to validate the users with "i am not a robot" checkbox. Here we are verifying the user login form using reCAPTCHA with AJAX method.


more details :
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http://www.skptricks.com/2017/12/captcha-code-php-jquery-ajax.html

source code:
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http://www.skptricks.com/2017/12/captcha-code-php-jquery-ajax.html