<?php
    // include the mailchimp php api files that you downloaded
    include('Mailchimp.php');
 
    $api_key = "api key"; //replace with your API key
    $list_id = "listid"; //replace with the list id you're adding the email to
 
    // set up our mailchimp object, and list object
    $Mailchimp = new Mailchimp( $api_key );
    $Mailchimp_Lists = new Mailchimp_Lists( $Mailchimp );
 
    $email = 'my@emailaddress.co.uk'; //replace with a test email
 
    try {
        $subscriber = $Mailchimp_Lists->subscribe( $list_id, array( 'email' => $email ) ); //pass the list id and email to mailchimp
    } catch (Exception $e) {
        //You'll need to write your own code to handle exceptions
    }
 
    // check that we've succeded
    if ( !empty( $subscriber['leid'] ) ) {
        echo 'Email Added to MailChimp';
    }
?>
 

 
<?php
defined('C5_EXECUTE') or die("Access Denied.");
 ?>
 
<form  role="form" method="post" id="subscribe">
 
    <input type="email"  id="email" name="email" placeholder="you@yourself.com" value="">
    <button type="submit">SUBSCRIBE</button>
 
</form>
 
<script>
$(document).ready(function() {
    $('#subscribe').submit(function() {
        if (!valid_email_address($("#email").val()))
        {
            $(".message").html('The email address you entered was invalid. Please make sure you enter a valid email address to subscribe.');
        }
        else
        {
 
            $(".message").html("<span style='color:green;'>Adding your email address...</span>");
            $.ajax({
                url: 'application/themes/testtheme/adduser.php', 
                data: $('#subscribe').serialize(),
                type: 'POST',
                success: function(msg) {
                    if(msg=="success")
                    {
                        $("#email").val("");
                        $(".message").html('<span style="color:green;">You have successfully subscribed to our mailing list.</span>');
 
                    }
                    else
                    {
                      $(".message").html('The email address you entered was invalid. Please make sure you enter a valid email address to subscribe.');  
                    }
                }
            });
        }
 
        return false;
    });
});
function valid_email_address(email)
{
    var pattern = new RegExp(/^[+a-zA-Z0-9._-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,4}$/i);
    return pattern.test(email);
}</script>