[wp-trac] [WordPress Trac] #5924: add_meta_box function not defined at plugin init

[WordPress Trac]

#5924: add_meta_box function not defined at plugin init
----------------------+-----------------------------------------------------
 Reporter:  jhodgdon  |       Owner:  anonymous
     Type:  defect    |      Status:  new      
 Priority:  normal    |   Milestone:  2.5      
Component:  General   |     Version:  2.5      
 Severity:  normal    |    Keywords:           
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 The API for adding sections to the post/page/link edit screens has changed
 for WordPress 2.5 -- previously you would use, for instance:
 {{{
   add_action('dbx_page_advanced', 'your_function' );
 }}}
 and in 2.5 you are supposed to use the add_meta_box function.

 The  problem is that if you want your plugin to work in pre-2.5 and 2.5,
 you need to detect which version is being used. The suggested logic is:

 {{{
 if( function_exists( 'add_meta_box' )) {
   add_meta_box( etc. );
  } else {
   add_action('dbx_page_advanced', etc. );
  }
 }}}

 The problem with this is that when the plugin is first loaded, and also
 during the 'init' action, the function add_meta_box is not yet defined. It
 is loaded later, from file wp-admin/includes/template.php

 My suggestion is to move the add_meta_box function into a different file,
 such as wp-includes/plugin.php, which is where the add_action and
 add_filter functions are defined.

 Tested in [6914]; I'll add a patch soon to move the function.

-- 
Ticket URL: <http://trac.wordpress.org/ticket/5924>
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