Coding

$page_conversations = $facebook->api('/'.$id.'/conversations', 'GET', array('access_token' => $AccessToken));

foreach ($page_conversations["data"][0]["participants"]["data"] as $participants) {
    echo "<pre>";
    var_dump($participants);
    echo "</pre>";
}

echo "<hr>";

foreach ($page_conversations["data"][0]["senders"]["data"] as $senders) {
    echo "<pre>";
    var_dump($senders);
    echo "</pre>";
}

echo "<hr>";

foreach ($page_conversations["data"][0]["messages"]["data"] as $messages) {
    echo "<pre>";
    var_dump($messages);
    echo "</pre>";
    echo $messages["message"];
}