Check if current page has given tag ID

6 comments

1. All the tags is inside the query, it is possible to check for this via get_query_var(); all objects inside the query.
   For the tag ID ask with this code: get_query_var( 'tag_ID' ); Also it is possible to check for tags, like get_query_var( 'term' ) and the taxonomy get_query_var( 'taxonomy' )

   So you can create an Loop with your tag data form your taxonomy; like

   $wpq = array ( 
       'post_type' => 'post',
       'post_status' => 'published',
       'taxonomy'=> get_query_var( 'taxonomy' ),
       'term'=> get_query_var( 'term' )
   );
   $query = new WP_Query( $wpq );
   while ( $query->have_posts() ) : $query->the_post();
   

   So you can check:
   if ( 'your_tad_id=== get_query_var( ‘tag_ID’ ) ) `

   • An hint; if you will use the check via $_REQUEST-var; please filter this data or use only for if statements.

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2. if ( is_object_in_term( $post->ID, 'post_tag', 'tag_slug_or_name_or_id_or_array' ) ) 
      do_my_funky_stuff();
   

   Update: Regarding the following comment:

   How to check if current page has tag_ID = “XXX” ?

   If that is any help the URL form WordPress admin looks like this:

   ...edit-tags.php?action=edit&taxonomy=company&ta‌g_ID=13&post_type=news

   So I’m guessing you mean “check if editing tag with ID X”?

   if ( isset( $_REQUEST['tag_ID'] ) && $_REQUEST['tag_ID'] == X )
       do_my_funky_stuff();
   

   You really must be a little clearer with your teminology 😉

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3. If you’re only interested in 3 subsequent tag_id’s you could start with narrowing down your query, using $_POST[‘tag_id’] and ‘tag__in’:

   $query_tag_id = $_POST['tag_id'];
   
   $news_query  = new WP_Query(array(
       'post_type' => 'news',
       'posts_per_page' => -1,
       'orderby' => 'date',
       'order' => 'ASC',
       'company' => $company,
       'tag__in' => array( $query_tag_id-1, $query_tag_id, $query_tag_id+1 )
   ));
   

   And you can refer back to the $query_tag_id variable in the if conditional tests, like:

   if( $tag_id == ( $query_tag_id - 1 ) ) {
       // do stuff
   }
   if( $tag_id == $query_tag_id ) {
       // do stuff
   }
   if( $tag_id == ( $query_tag_id + 1 ) ) {
       // do stuff
   }
   

   I’d expect that the suggestion made by TheDeadMedic would do the trick when you combine it with the above. Like this for the middle if test:

   if ( is_object_in_term( $post->ID, 'post_tag', $query_tag_id ) ) 
      do_my_funky_stuff();
   

   Failing that you could always get all the tag ids for the active post in the while loop and use those in the if tests. So you’d have to replace

   $tag_id = get_query_var('tag_id');
   

   with:

   $tags = get_the_tags();
   $tag_ids = array();
   if( $tags ) {
       foreach ( $tags as $tag ) {
           $tags_id[] = $tag->term_id;
       }
   }    
   
   if ( in_array( ( $query_tag_id - 1 ) , $tag_ids ) ) {
       // do stuff
   }
   etc.
   

   If you’re certain your posts are only going to have one tag, you could simplify things by using:

   $tags = get_the_tags();
   $tag_id = ( $tags ) ? $tags[0]->term_id : 0;
   
   if( $tag_id == ( $query_tag_id - 1 ) ) {
       // do stuff
   }
   etc.
   

   Update:
   On a side note, get_query_var() does not work because it looks for the parameters you set in the query. You didn’t set any tag_id in the query, so it does not return anything. So changing the query as I suggested at the start of my answer would get you a return value, but not one you could use.

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4. $url = "http://localhost/website/wp-admin/edit-tags.php?action=edit&taxonomy=company&ta‌g_ID=13&post_type=news";
   if (strpos($url, "tag_ID=13")!==false){
        //Do stuff here if it is there
   }
   else {
        //Do Other Stuff here if it is not there
   }
   

   For WordPress’ sake, throw that into a function in the functions.php and add a hook, like init (Bare in mind this would be specific just to that tag)
   You could make it conditional by setting a couple variables and testing to see if it equals a particular value.

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5. Try globalizing $wp_query since your doing this within a function.

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6. Haven’t tested this, but it should work.

   <?php
   // Gets the current Post ID
   function get_postID(){
       global $wp_query;
       $thePostID = $wp_query->post->ID;
       return $thePostID;
   }
   
   // Check for specified Term ID
   function check_term_id($id){
       $postID = get_postID();
       $post = get_post($postID);
       $taxonomies = get_object_taxonomies($post->post_type);
       foreach($taxonomies as $taxonomy){
           $terms = get_the_terms($post->ID, $taxonomy);
           if(!empty($terms)){
               for($i = 0; $i < count($terms); $i++){
                   if($terms[$i]->term_id == $id){
                       $return = $terms[$i];
                   } else{
                       $return = 'error';  
                   }
               }
           }
       }
       return $return;
   }
   
   $checkTerm = check_term_id('xxx');
   if($checkTerm != 'error'){
       //Do something with the term data.
   }
   ?>
   

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