Check is category parent or not from its ID

2 comments

1. You can do something like this:

   function category_has_parent($catid){
       $category = get_category($catid);
       if ($category->category_parent > 0){
           return true;
       }
       return false;
   }
   

   and use it like this:

   if (category_has_parent('22')){
      //true there is a parent category
   }else{
      //false this category has no parent
   }
   

   Update:

   to check the other way around (if a category has children) you can use get_categories

   $children = get_categories(array('child_of' => id,'hide_empty' => 0));
   if (count($children) > 1){
       //has childern
   }else{
       //no children
   }
   

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2. Have a look at the Codex: http://codex.wordpress.org/Function_Reference/get_category_parents

   // returns true or false    
   function check_category( $cat_id ){
       $parent = '';
       $parent = get_category_parents( $cat_id );
       return empty($parent);
   }
   

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