Create invisible wordpress custom fields

Many plugins use custom fields to store data about individual posts. When a plugin adds a custom fields, its key and value (or name and value) are listed in the Custom Fields meta box. For instance, a syntax hilighting plugin may set a custom field syntax_enabled on posts that use the syntax highlighting CSS.

Often the user doesn’t need to see this information and it can leed to needless confusion. Unless the user needs to edit these custm field values there’s really no need to have them listed here.

How to Hide Custom Fields

Custom fields can be hidden from the Custom Fields meta box quite easily. Typically custom fields are added by using the following code:

add_post_meta($id, 'name', 'value');

To hide your custom field from user view, simply start the name of your custom field with and underscore (”_”). So create your custom field like this:

add_post_meta($id, '_name', 'value');

Your custom field is now hidden.