how to add recaptcha validation in php

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03 Apr 2018

1index.html
2
3<html>
4  <head>
5    <title>Google recapcha demo - Codeforgeek</title>
6    <script src='https://www.google.com/recaptcha/api.js'></script>
7  </head>
8  <body>
9    <h1>Google reCAPTHA Demo</h1>
10    <form id="comment_form" action="form.php" method="post">
11      <input type="email" placeholder="Type your email" size="40"><br><br>
12      <textarea name="comment" rows="8" cols="39"></textarea><br><br>
13      <input type="submit" name="submit" value="Post comment"><br><br>
14      <div class="g-recaptcha" data-sitekey="=== Your site key ==="></div>
15    </form>
16  </body>
17</html>
18verify.php
19
20<?php
21    $email; $comment; $captcha;
22
23    if(isset($_POST['email']))
24        $email=$_POST['email'];
25    if(isset($_POST['comment']))
26        $comment=$_POST['comment'];
27    if(isset($_POST['g-recaptcha-response']))
28        $captcha=$_POST['g-recaptcha-response'];
29
30    if(!$captcha){
31        echo '<h2>Please check the the captcha form.</h2>';
32        exit;
33    }
34
35    $response = json_decode(file_get_contents("https://www.google.com/recaptcha/api/siteverify?secret=YOUR SECRET KEY&response=".$captcha."&remoteip=".$_SERVER['REMOTE_ADDR']), true);
36    if($response['success'] == false)
37    {
38        echo '<h2>You are spammer ! Get the @$%K out</h2>';
39    }
40    else
41    {
42        echo '<h2>Thanks for posting comment.</h2>';
43    }
44?>

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