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I have a multi author blog, I want to restrict authors from adding custom fields with a particular key.

For example I dont want authors to edit or add the custom field "rating"

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when i work on a multi author blog, i remove the custom fields meta box and add a new one with my own options that way i can control what is shown to whom. – Bainternet Jan 24 '11 at 19:05
how to remove the custom fields box? – Satish Gandham Jan 24 '11 at 20:26
remove_meta_box( 'postcustom','post','normal' ); – Bainternet Jan 25 '11 at 6:24

The way I would approach this is:

  1. Create a custom field with an underscore in front of it - Example: _rating this way it doesn't show up in the normal custom field interface
  2. Create a meta box that manages this custom field
  3. Wrap your add_meta_box function with if(current_user_can('administrator'))

This will only create the meta box if a user is an administrator. It's not a fireproof method unless you disable the custom field interface.

If this is a plugin you can use remove_meta_box if the user is not an administrator before the post edit page renders.

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