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PHP, MYSQL, JQUERY, ANGULARJS, AJAX, CODEIGNITER, LARAVEL TUTORIAL. If you not know how to add Google reCaptcha in PHP form, then you have come on right place. Because in this post you can find solution of How to integrate Google reCaptcha in PHP form and here you can also find how to validate PHP form with Google reCaptcha by using Ajax jQuery. Form data has been validate with Google reCaptcha is required because we all know spamming is one of very common problem which has been faced on web. Every Website owner prevent their website from invalid spam traffic or spam comment. Before programmer has used random captcha code for prevent spamming or bots filled in their website form. But this is old method and now most of the web application has been used Google reCAPTCHA, for verify that form input field has been filled by any human. Google reCAPTCHA is very simple to verify that he is user. User can verify just in single click for that they are not a robot. Below you can find step by step guide for How to build PHP spam free form by using Google reCaptcha. For get Google reCaptcha API key, you first have Google account. If you have google account, then login into your Google account and visit Once you have visit above link then, you can see above image web page. Here you have to define label name, domain name in which you want to integrate Google reCaptcha and click on submit bu*ton. Here we want to use in localhost also so we have include localhost in domain list also. And lastly click on submit bu*ton, then you can get API key, which you can see below. In this tutorial, we will create our HTML form in index.php file. So, in this file first we need to add reCAPTCHA ja*ascript library in our After this we want to add following HTML code for generate Google reCAPTCHA widget in form. Here in DATA-SITEKEY value, we have to add site key which we have get from Google reCAPTCHA api key. Once you have add this code and refresh web page then Google reCaptcha widget will be created in your web page. Below you can source code of index.php file