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############################# In header #############################

<script src='https://www.google.com/recaptcha/api.js'></script>

############################# By Submit Button #############################

<div class="g-recaptcha" data-sitekey="ayyyayyayhsTAAAAAOaH8nt_1z00zu6BGxVZ87"></div>


############################# In process form #############################

<?php
if(isset($_POST['g-recaptcha-response'])){
         $captcha=$_POST['g-recaptcha-response'];
       }
       if(!$captcha){
         echo '<br><br><h2>Please check the the captcha form.</h2>';
         
       }
       $secretKey = "ayyyayyayhsTAAAAAOaH8nt_1z00zu6BGxVZ87";
       $ip = $_SERVER['REMOTE_ADDR'];
       $response=file_get_contents("https://www.google.com/recaptcha/api/siteverify?secret=".$secretKey."&response=".$captcha."&remoteip=".$ip);
       $responseKeys = json_decode($response,true);
       if(intval($responseKeys["success"]) !== 1) {
         echo '<br><br><h2>Spammers are not welcome here!</h2>';
       } else {
         echo '';
       }
?>