gistfile1.php

<?php  
$user_id = $_SESSION['user']['id'];

    $STH = $pdo->query ( "SELECT * FROM dialog WHERE recive = $user_id OR send = $user_id ORDER by id DESC" );
    $STH->setFetchMode ( PDO::FETCH_OBJ );
    $row = $STH->fetch ();
    $us_log1 = $row->send;
    $us_log2 = $row->recive;
    if ($us_log2 == $user_id) ($us_log2 = $us_log1);

    $STH = $pdo->query ( "SELECT * FROM `users`);
    $STH->setFetchMode ( PDO::FETCH_OBJ );
    $users = $STH->fetchAll();

        $STH = $pdo->query ( "SELECT * FROM dialog WHERE recive = $user_id OR send = $user_id ORDER by id DESC" );
        $STH->setFetchMode ( PDO::FETCH_OBJ );
        while ($row = $STH->fetchAll()) {
            ?>
            <div class="dialogi">

                <div id="123">отправитель <?=$users[$row->recive]->login?>  получатель <?=$users[$row->send]->login?></b></div>

            </div>
            <?php
        }