php - what the best way to add multiple tags to a blog post? -

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I really want to add more than one tag to a blog post when users select them from a field, To store the tags in Mysql, I have the fields to keep all tags, or one by one or 

  tag_field = (cats, animals, fur)   
 OR  cats id2 animals id 3 fir   
 I used the first example Area was thinking and was detonated lists and they were separated in a tag when the user brings them !!! :)) Thanks   
 
 
 You should use three tables:  
     
  •  A table where you store posts; One line per line  
  •  A table where you store tags;       
  •  
  •   
  •       Used by many posts, and a post can contain many tags - and there is no duplication of any kind of data.  
     
     So, basically, your table will look like this:  
      Post-ID; Primary key - Date - Title - Content tag - ID; Primary key - name posts_tags - tag_id; primary key ; Foreign key for tags. Tag_id - post_id; primary key ; Foreign key for Posts.post_id

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