Please help me implement Google reCAPTCHA server side

Hey guys,

Can you please help me implement Google reCAPTCHA into my contact form?

So far I have JS in the head tag.

HTML

    <!-- Form -->
		<div id="contact-form">
			<form method="post" action="contact.php">
				
				<div class="field">
					<label>Name:</label>
					<input type="text" name="name" class="text" />
				</div>
				
				<div class="field">
					<label>Email: <span>*</span></label>
					<input type="text" name="email" class="text" />
				</div>
				
				<div class="field">
					<label>Message: <span>*</span></label>
					<textarea name="message" class="text textarea" ></textarea>
				</div>

<div class="g-recaptcha" data-sitekey="6LcePAATAAAAAGPRWgx90814DTjgt5sXnNbV5WaW"></div>
				
				<div class="field">
					<input type="button" class="button light medium" id="send" value="Send Message"/>
				</div>
                
                <div class="field">
				<input type="button" class="button gray medium" value="Reset!"/>
				</div>		
                <div class="loading"></div>

                
                
			</form>
		</div>

PHP

<?php

//Retrieve form data. 
//GET - user submitted data using AJAX
//POST - in case user does not support javascript, we'll use POST instead
$name = ($_GET['name']) ? $_GET['name'] : $_POST['name'];
$email = ($_GET['email']) ?$_GET['email'] : $_POST['email'];
$message = ($_GET['message']) ?$_GET['message'] : $_POST['message'];

//flag to indicate which method it uses. If POST set it to 1
if ($_POST) $post=1;

//Simple server side validation for POST data, of course, you should validate the email
if (!$name) $errors[count($errors)] = 'Please enter your name.';
if (!$email) $errors[count($errors)] = 'Please enter your email.'; 
if (!$message) $errors[count($errors)] = 'Please enter your message.'; 

//If the errors array is empty, send the mail
if (!$errors) {

	// ====== Your mail here  ====== //
	$to = 'admin@mysite.com.au <admin@mysite.com.au>';
	
	// Sender
	$from = $name . ' <' . $email . '>';
	
	//subject and the html message
	$subject = 'Contact Message from the My Website';	
	$message = '
	<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" 
	"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
	<html xmlns="http://www.w3.org/1999/xhtml">
	<head></head>
	<body>
	<table>
		<tr><td>Name:</td><td>' . $name . '</td></tr>
		<tr><td>Email:</td><td>' . $email . '</td></tr>
		<tr><td>Message:</td><td>' . nl2br($message) . '</td></tr>
	</table>
	</body>
	</html>';

	// Send the mail
	$result = sendmail($to, $subject, $message, $from);
	
	//if POST was used, display the message straight away
	if ($_POST) {
		if ($result) echo 'Thank you! We have received your message.';
		else echo 'Sorry, unexpected error. Please try again later';
		
	//else if GET was used, return the boolean value so that 
	//ajax script can react accordingly
	//1 means success, 0 means failed
	} else {
		echo $result;	
	}

// If the errors array has values
} else {}


    // Simple mail function with HTML header
    function sendmail($to, $subject, $message, $from) {
    	$headers = "MIME-Version: 1.0" . "\r\n";
    	$headers .= "Content-type:text/html;charset=iso-8859-1" . "\r\n";
    	$headers .= 'From: ' . $from . "\r\n";
	
	$result = mail($to,$subject,$message,$headers);
	
	if ($result) return 1;
	else return 0;
}

?>

Basic Usage:

Form:
Include scripts and .g-recaptcha/ your public key

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

<form method="POST">
    <div class="g-recaptcha" data-sitekey="your_site_key"></div>
    <input type="submit" value="Submit">
</form>

POST Script:
Submit the request to google and get a response with private key:

    <?php
    
    $response=file_get_contents("https://www.google.com/recaptcha/api/siteverify?secret=". $yoursecret."&response=".$_POST['g-recaptcha-response']."&remoteip=".$_SERVER['REMOTE_ADDR']);
    $googleobj = json_decode($response);
    $verified = $googleobj->success;

    if ($verified === true){
      //do stuff
    }

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