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<?php

$data = array('apikey'=>$apiKey,'id'=>$listID,'email_address'=>$email);

$memberId = md5(strtolower($email));
$dataCenter = substr($apiKey, strpos($apiKey, '-') + 1);

$endpoint = 'https://' . $dataCenter . '.api.mailchimp.com/3.0/lists/' . $listID . '/members/' . $memberId;

$json_data = json_encode($data);
$options = array(
	'http' => array(
	'method' => 'PUT',
	'header' => implode(
	"\r\n",[
		"Content-type: application/json",
		"Content-length: " . strlen($json_data),
		"Authorization: Basic " . base64_encode("anystring:$apiKey")
	]),
	'content' => $json_data,));

$context = stream_context_create($options);
$result = file_get_contents($endpoint, false, $context); 

$result = json_decode($result);
print_r($result);