how to add recaptcha validation in php

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how to add recaptcha validation in php -

index.html

&lt;html&gt;
  &lt;head&gt;
    &lt;title&gt;Google recapcha demo - Codeforgeek&lt;/title&gt;
    &lt;script src='https://www.google.com/recaptcha/api.js'&gt;&lt;/script&gt;
  &lt;/head&gt;
  &lt;body&gt;
    &lt;h1&gt;Google reCAPTHA Demo&lt;/h1&gt;
    &lt;form id="comment_form" action="form.php" method="post"&gt;
      &lt;input type="email" placeholder="Type your email" size="40"&gt;&lt;br&gt;&lt;br&gt;
      &lt;textarea name="comment" rows="8" cols="39"&gt;&lt;/textarea&gt;&lt;br&gt;&lt;br&gt;
      &lt;input type="submit" name="submit" value="Post comment"&gt;&lt;br&gt;&lt;br&gt;
      &lt;div class="g-recaptcha" data-sitekey="=== Your site key ==="&gt;&lt;/div&gt;
    &lt;/form&gt;
  &lt;/body&gt;
&lt;/html&gt;
verify.php

&lt;?php
    $email; $comment; $captcha;

    if(isset($_POST['email']))
        $email=$_POST['email'];
    if(isset($_POST['comment']))
        $comment=$_POST['comment'];
    if(isset($_POST['g-recaptcha-response']))
        $captcha=$_POST['g-recaptcha-response'];

    if(!$captcha){
        echo '&lt;h2&gt;Please check the the captcha form.&lt;/h2&gt;';
        exit;
    }

    $response = json_decode(file_get_contents("https://www.google.com/recaptcha/api/siteverify?secret=YOUR SECRET KEY&amp;response=".$captcha."&amp;remoteip=".$_SERVER['REMOTE_ADDR']), true);
    if($response['success'] == false)
    {
        echo '&lt;h2&gt;You are spammer ! Get the @$%K out&lt;/h2&gt;';
    }
    else
    {
        echo '&lt;h2&gt;Thanks for posting comment.&lt;/h2&gt;';
    }
?&gt;

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how to add recaptcha validation in php

how to add recaptcha validation in php -

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