Add a new category to the database if it does not already exist.
get_category_to_edit
Get category object for given ID and ‘edit’ filter context.
category_exists
Check whether a category exists.
set_current_screen
Set the current screen object
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get_current_screen
Get the current screen object
add_screen_option
Register and configure an admin screen option
get_hidden_meta_boxes
Gets an array of IDs of hidden meta boxes.
meta_box_prefs
Prints the meta box preferences for screen meta.
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get_hidden_columns
Get a list of hidden columns.
get_column_headers
Get the column headers for a screen
populate_site_meta
Creates WordPress site meta and sets the default values.
populate_network_meta
Creates WordPress network meta and sets the default values.
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populate_network
Populate network settings.
install_network
Install Network.
populate_roles_300
Create and modify WordPress roles for WordPress 3.0.