检索视频标签的查询不会返回正确的值

Question

I have page where I load 10 videos. Now I'm trying to show for each video what tags has. So I've loaded videos then I trying like this for the tags

$tags = $pdo->prepare("Select * From `video` p LEFT JOIN `tags_image` tp ON p.video_id = tp.video_id LEFT JOIN `tag` t ON tp.tags_id = t.tag_id WHERE p.video_id = ?");
$tags -> bindParam(1, $row['video_id'], PDO::PARAM_INT);
$tags -> execute();
foreach($tags as $tag) {
    if(!$tag){
            echo '<li style="margin-top: -13px;"><a href="tagsPreview.php?tag_id='.$tag['tag_id'].'">'.$tag['tag_name'].'</a></li>';  
    }
    else {
            echo '<li style="margin-top: -13px;"><a href="">No tags found for the video</a></li>';
    }                  
}

Tables in database are video - video_id , video_name ... etc

tag - tag_id , tag_name

tags_image - tags_id , video_id .

So when I open the page video with ID=1 has associated 5 tags but video get 5 times - No tags found for the video instead of 5 tags. What I miss here?

Answer 1

replace your code with:

if(!empty($tag['tag_id'])){
            echo '<li style="margin-top: -13px;"><a href="tagsPreview.php?tag_id='.$tag['tag_id'].'">'.$tag['tag_name'].'</a></li>';  
    }
    else {
            echo '<li style="margin-top: -13px;"><a href="">No tags found for the video</a></li>';
    }   

Answer 2

This should work.

foreach($tags as $tag) {
    if($tag['tag_id']){
            echo '<li style="margin-top: -13px;"><a href="tagsPreview.php?tag_id='.$tag['tag_id'].'">'.$tag['tag_name'].'</a></li>'; 
    } else {
            echo '<li style="margin-top: -13px;"><a>Към видеото няма добавени тагове</a></li>';
    }                 
}