Get WordPress tags from a certain post by its ID?

Question

I've searched all over the place and scoured the API. All I'm coming up with are ways to get POSTS by a TAG, but not get the TAGS of a SPECIFIC post by its ID.

What I'm trying to do is pretty simple - I have a post and I want to check if it has a specific tag - 'specialtag' - and then do something on that page if it has this tag. Nothing seems to point me in the right direction. Is there something I'm not seeing?

Answer 1

It's simple, you can use get_the_tags function like this :

CODEX: The function return an array of objects, one object for each tag assigned to the post.

Example 1:

If you have the post ID you can retrieve the tag associated with the post by this code

$postid = $post->ID; 
get_the_tags($postid);

Example 2:

retrieve the tag associated with the post inside the loop

$posttags = get_the_tags();
if ($posttags) {
  foreach($posttags as $tag) {
    echo $tag->name . ' '; 
  }
}

this function is used in The Loop, then no ID need be passed

Example 3:

retrieve the tag associated with the post outside the loop

global $post;
   foreach(get_the_tags($post->ID) as $tag) {
      echo $tag->name . ', ';
   }