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http://www.codexworld.com/new-google-recaptcha-with-php/

http://www.codediesel.com/security/integrating-googles-new-nocaptcha-recaptcha-in-php/

include in header:
<script src="https://www.google.com/recaptcha/api.js" async defer></script>


<form action="" method="POST">
    <input type="text" name="name" value="" />
    <input type="text" name="email" value="" />
    <textarea type="text" name="message"></textarea>
    <div class="g-recaptcha" data-sitekey="9LDDpf0eVtMZY6kdJnGhsYYY-5ksd-W"></div>
    <input type="submit" name="submit" value="SUBMIT">
</form>



<?php
if(isset($_POST['submit']) && !empty($_POST['submit'])):
    if(isset($_POST['g-recaptcha-response']) && !empty($_POST['g-recaptcha-response'])):
        //your site secret key
        $secret = '9LuDh9kyetYYYYdT0jsVckScsH8Ks3KA';
        //get verify response data
        $verifyResponse = file_get_contents('https://www.google.com/recaptcha/api/siteverify?secret='.$secret.'&response='.$_POST['g-recaptcha-response']);
        $responseData = json_decode($verifyResponse);
        if($responseData->success):
            //contact form submission code
            $name = !empty($_POST['name'])?$_POST['name']:'';
            $email = !empty($_POST['email'])?$_POST['email']:'';
            $message = !empty($_POST['message'])?$_POST['message']:'';
            
            $to = 'contact@codexworld.com';
            $subject = 'New contact form have been submitted';
            $htmlContent = "
                <h1>Contact request details</h1>
                <p><b>Name: </b>".$name."</p>
                <p><b>Email: </b>".$email."</p>
                <p><b>Message: </b>".$message."</p>
            ";
            // Always set content-type when sending HTML email
            $headers = "MIME-Version: 1.0" . "\r\n";
            $headers .= "Content-type:text/html;charset=UTF-8" . "\r\n";
            // More headers
            $headers .= 'From:'.$name.' <'.$email.'>' . "\r\n";
            //send email
            @mail($to,$subject,$htmlContent,$headers);
            
            $succMsg = 'Your contact request have submitted successfully.';
        else:
            $errMsg = 'Robot verification failed, please try again.';
        endif;
    else:
        $errMsg = 'Please click on the reCAPTCHA box.';
    endif;
else:
    $errMsg = '';
    $succMsg = '';
endif;
?>