Php 按用户名将所有消息分组，就像Facebook一样

好的，经过几个小时的编码，我最终得到了这个代码，我被困在这里。我想做的是，如果你转到你的Facebook消息，你会看到Facebook将用户名中的所有消息分组并显示在页面上，这正是我想做的

下面是我的代码。还是想为我做点什么。还有当前代码示例的屏幕截图

SQL

<?php
    $session_id = GET_SESSION_ID_VALUE(ENCRYPTION_KEY);
    $sql = "SELECT messages.*, profile.profile_id, profile.profile_name, profile.profile_photo, profile.profile_username FROM messages INNER JOIN profile ON profile.profile_id = messages.message_from WHERE messages.message_from = ' " . $session_id . "' OR messages.message_to = ' " . $session_id . "' ORDER BY messages.message_datetime DESC";
    $query = $db->SELECT($sql);
    if($db->NUM_ROWS() > 0){
        $rows = $db->FETCH_OBJECT();
        foreach($rows as $row){
            $message_id = $row->message_id;
            $message_from = $row->message_from;
            $message_content = $row->message_content;
            $message_content = (strlen($message_content) > 90) ? substr($message_content, 0, 100) . '...' : $message_content;
            $message_username = $row->profile_username;
            $message_name = $row->profile_name;                     
            $message_photo = $row->profile_photo;                       
        /* HTML GOES HERE */
        }
    }
    ?>

数据库表

以上代码的屏幕截图。

---

您不需要将消息来源添加到ORDER BY子句中吗？

<?php
    $session_id = GET_SESSION_ID_VALUE(ENCRYPTION_KEY);
    $sql = "SELECT messages.*, profile.profile_id, profile.profile_name, profile.profile_photo, profile.profile_username FROM messages INNER JOIN profile ON profile.profile_id = messages.message_from WHERE messages.message_from = ' " . $session_id . "' OR messages.message_to = ' " . $session_id . "' ORDER BY messages.message_datetime DESC";
    $query = $db->SELECT($sql);
    if($db->NUM_ROWS() > 0){
            $prevMessage_from=""; --Get name of previous message
            $rows = $db->FETCH_OBJECT();
            foreach($rows as $row){
            while ($prevMessage_from=$row->message_from)
             {--Here must be code that add messages to existing--}
            if ($prevMessage_from<>$row->message_from)
            {
            $message_id = $row->message_id;
            $message_from = $row->message_from;
            $message_content = $row->message_content;
            $message_content = (strlen($message_content) > 90) ? substr($message_content, 0, 100) . '...' : $message_content;
            $message_username = $row->profile_username;
            $message_name = $row->profile_name;                     
            $message_photo = $row->profile_photo;                       
            $prevMessage_from=$message_from;
            /* HTML GOES HERE */
            }

        }
    }
    ?>