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house.tc | 05/25/12 at 1:54pm Edit

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• 
  Last edited:
  05/25/12
  2:09pm
  Arnav Joy says:

  you can use following function
  <?php wp_insert_term( $term, $taxonomy, $args = array() ); ?>
  

  Previous versions of this answer: 05/25/12 at 2:09pm
• 
  Last edited:
  05/25/12
  2:06pm
  Francisco Javier Carazo Gil says:

  You have to do a call to wp_insert_term when you are saving or updating value of custom field.

  • 05/25/12 2:14pm
    
    Francisco Javier Carazo Gil says:

    You have to use this function at the same time you save your meta with update post meta: http://codex.wordpress.org/Function_Reference/update_post_meta
    
    If the values has changed, you have to be careful, first check if new value exists with has_term http://codex.wordpress.org/Function_Reference/has_term and later:
    * if exist in the same post: do nothing
    * if not exist: delete the old term with old value and create a new one
    
    

  • 05/25/12 2:30pm
    
    house.tc says:

    The problem is I am using plugin to create those custom meta field. How do I use update_post_meta? Hook in function.php? It would be great if you have some example of the codes. thanks

• 
  Last edited:
  05/25/12
  2:23pm
  John Cotton says:

  Can I ask why you want to do this?
  
  If you're going to set a taxonomy value, surely the custom field is redundant? (Or vice versa)
  
  You can query by taxonomy and query taxonomy by post....I can't think of a reason why you want this :)

  • 05/25/12 2:42pm
    
    house.tc says:

    Well, since there are no plugin to create custom taxonomy input panels (like dropdown, button, etc) ,create custom meta field is much easier with plugin. Besides, there are many fields my post-type, it would be very time consuming to create each taxonomy manually.
    
    However, taxonomy is easier to categories or sort in the front end. Custom field in the other hand is lack of this advantage.
    
    I know it sound stupid to do this, but be frankly I am not too familiar with wp, so I couldn't come up a better idea.

  • 05/25/12 2:58pm
    
    John Cotton says:

    Since you're going to have to write some code somewhere to do what you want, you'll find it much easier to code what you want directly without the custom field plugin....
    
    Have a look at this:
    
    http://codex.wordpress.org/Function_Reference/add_meta_box
    
    It shows you how to code your own meta box. With it, you can add all sorts of user interface to get what you want. Better code....easier for the user....

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