<a class="user_avatar" href='<?php echo url("user-$thread[uid]");?>' tabindex="-1">
    <img class="avatar-3 mr-3" src="<?php echo $thread['user_avatar_url'];?>">
</a>
<div>
    <div class="a">
        <span class="username">
            <a href="<?php echo url("user-$thread[uid]");?>"
                class="text-muted font-weight-bold"><?php echo $thread['username'];?></a>
        </span>
    </div>
    <div class="b">