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1. rajuru
   Member
   Posted 3 years ago #

   hello,
   today while going to make a plugin, I found this problem. after trying a lot i see that add_meta_box() function shows it does not exist.

   here is the code I run to test availability:
   if(function_exists('add_meta_box')) {
   echo 'This function is available';
   } else {
   echo 'This function is not available';
   }

   Output:
   This function is not available

   I get same thing on 2.7 and 2.6.2. but I can easily see that the function is available in template.php file. even my editor (eclipse) can jump to the function when I click.

   how can I solve it? i need to add an extra box in post created/edit area.

2. MichaelH
   Volunteer
   Posted 3 years ago #

   That means add_meta+box hasn't been "defined" yet.

   Ozh explains:
   http://planetozh.com/blog/2008/02/wordpress-snippet-add_meta_box/

   Other:
   Function_Reference/add_meta_box
   Plugin_API

3. rajuru
   Member
   Posted 3 years ago #

   hello Michael,
   Thanks for your reply. but how to define it? i see the links says this feature is introduced by WordPress 2.5+. so it is a core function. isn't it?

   thanks

4. MichaelH
   Volunteer
   Posted 3 years ago #

   You don't define it, but as Ozh explains:

   The catch here is to hook the function that add our "meta box" (here: add_some_box()) late enough so that the function it needs, add_meta_box(), has been defined. Hooking on 'admin_menu' is fine.

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