home.php

<?php
        $email;$comment;$captcha;
        if(isset($_POST['name'])){
          $name=$_POST['name'];
        }if(isset($_POST['lname'])){
          $lname=$_POST['lname'];
        }if(isset($_POST['g-recaptcha-response'])){
          $captcha=$_POST['g-recaptcha-response'];
        }
        if(!$captcha){
          echo '<h2>Please check the the captcha form.</h2>';
          exit;
        }
        $secretKey = "server side key";
       
        $response=file_get_contents("https://www.google.com/recaptcha/api/siteverify?secret=".$secretKey."&response=".$captcha."&remoteip");
        $responseKeys = json_decode($response,true);
        if(intval($responseKeys["success"]) !== 1) {
          echo '<h2>You are spammer ! Get the @$%K out</h2>';
        } else {
          echo '<h2>Thanks for posting comment.</h2>';
        }
?>