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In this tutorial we can see how to subscribe to the mailchimp subscribe list using php programmatically via api,

For this you need a mailchimp account, api key and list id 

you can see the tutorials to get api-key and list id using links

we are using PHP and curl for posting request to mailchimp servers, follow the steps and code, code is simple a php file with subscribe form in that you can enter firstname lastname and emails to subscribe to mailing list of mailchimp.

 

<?php

if($_POST){

    $data = [
        'email'     => $_POST['email'],
        'status'    => 'subscribed',
        'firstname' => $_POST['firstname'],
        'lastname'  => $_POST['lastname']
    ];
    
    // NOTE: status having 4 Option --"subscribed","unsubscribed","cleaned","pending"
    $res = syncMailchimp($data);
    
    if($res == 200){
        echo '<div class="alert alert-success" role="alert">Subscribed Successfull</div>';
    }else{
        echo '<div class="alert alert-danger" role="alert">Unable to Subscribe at the moment, try again later</div>';
    }
}


function syncMailchimp($data)
{
    $apiKey = 'YOUR_API_KEY;
    $listId = 'YOUR_LIST_ID';

    $memberId = md5(strtolower($data['email']));
    $dataCenter = substr($apiKey, strpos($apiKey, '-') + 1);
    $url = 'https://' . $dataCenter . '.api.mailchimp.com/3.0/lists/' . $listId . '/members/' . $memberId;

    $json = json_encode([
        'email_address' => $data['email'],
        'status'        => $data['status'],
        'merge_fields'  => [
            'FNAME'     => $data['firstname'],
            'LNAME'     => $data['lastname']
        ]
    ]);

    $ch = curl_init($url);

    curl_setopt($ch, CURLOPT_USERPWD, 'user:' . $apiKey);
    curl_setopt($ch, CURLOPT_HTTPHEADER, ['Content-Type: application/json']);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($ch, CURLOPT_TIMEOUT, 10);
    curl_setopt($ch, CURLOPT_CUSTOMREQUEST, 'PUT');
    curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
    curl_setopt($ch, CURLOPT_POSTFIELDS, $json);

    $result = curl_exec($ch);
    $httpCode = curl_getinfo($ch, CURLINFO_HTTP_CODE);
    curl_close($ch);

    return $httpCode;
}

?>

<!doctype html>
<html lang="en">

<head>
    <!-- Required meta tags -->
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">

    <!-- Bootstrap CSS -->
    <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css">

    <title>Subscribe To Mailchimp</title>
</head>

<body class="container">
    <h3>Subscribe To Mailchimp</h3>

    <form action="#" method="POST" id="suscribeForm">
        <div class="form-group">
            <label for="firstname">First Name</label>
            <input type="text" class="form-control" id="firstname" name="firstname" placeholder="First name" required> 
        </div>
        <div class="form-group">
            <label for="lastname">Last Name</label>
            <input type="text" class="form-control" id="lastname" name="lastname" placeholder="Last Name" required>
        </div>
        <div class="form-group">
            <label for="email">Email address</label>
            <input type="email" class="form-control" id="email" name="email" placeholder="Enter email" required>
        </div>
        <input type="submit" class="btn btn-primary" value="Submit"/>
    </form>

    <!-- Optional JavaScript -->
    <!-- jQuery first, then Popper.js, then Bootstrap JS -->
    <script src="https://code.jquery.com/jquery-3.2.1.slim.min.js"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.9/umd/popper.min.js"></script>
    <script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js"></script>
</body>

</html>

Just replace your API KEY and LIST ID and your are all set.

Note: we are using bootstrap and additional js to to look pretty you can avoid that if you don;t like, thanks

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