<?php
$url = 'https://www.exacttargetapis.com/contacts/v1/contacts';
$json = '{
    "contactKey": "test@example.com",
    "attributeSets": [{
        "name": "Email Addresses",
        "items": [{
            "values": [{
                "name": "Email Address",
                "value": "test@example.com"
            }]
        }]
    }]
}';

$options = array(
    'http' => array(
        'header' =>  "Content-Type: application/jsonrn" .
            "Accept: application/jsonrn" .
            "Authorization: Bearer " . $access_token . "rn",
        'method'  => 'POST',
        'content' => http_build_query($json)
    )
);
$context  = stream_context_create($options);
$result = file_get_contents($url, false, $context);

if ($result === FALSE) { echo "Result not returned"; }
print_r($result);
?>