How to Subscribe to List using MailChimp API using PHP

MailChimp is an email marketing service, helps to manage the subscribers of your website. MailChimp provides an easy way to integrate email signup form in your website and send the email newsletter to the subscriber.

Code

$apiKey = 'InsertMailChimpAPIKey';
$listID = 'InsertMailChimpListID';
// MailChimp API URL
$memberID = md5(strtolower($email));
$dataCenter = substr($apiKey,strpos($apiKey,'-')+1);
$url = 'https://' . $dataCenter . '.api.mailchimp.com/3.0/lists/' . $listID . '/members/' . $memberID;


$jsondata = json_encode([
        'email_address' => $email,
        'status'        => 'subscribed',
        'merge_fields'  => [
                'FNAME'     => "Alex",
                'LNAME'     => "Alex"
        ]
]);

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