[wp-trac] [WordPress Trac] #5541: Refactor and simplify WP_Roles

[WordPress Trac]

#5541: Refactor and simplify WP_Roles
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 Reporter:  tellyworth   |       Owner:  anonymous
     Type:  enhancement  |      Status:  new      
 Priority:  normal       |   Milestone:  2.5      
Component:  General      |     Version:           
 Severity:  normal       |    Keywords:  has-patch
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 This patch simplifies the way WP_Roles is implemented.  Roles are no
 longer stored in the options table.  Instead they are populated at runtime
 by an action.  An action handler in capabilities.php populates the
 standard roles with current default capabilities.  Plugins can hook the
 same init_roles action to create their own roles.

 I also included some related fixes and improvements:

 * Capabilities were duplicated in two places previously (in
 WP_Roles::roles and again in WP_Role::capabilities).  This created a bug
 where calling $wp_roles->add_cap() could cause the two to get out of sync.
 They're kept in a single place now.

 * There's a new "{$role}_has_cap" filter that's considerably easier to use
 than the old role_has_cap filter (it has only one argument).

 Issues: I deliberately haven't yet provided an upgrade path for blogs that
 have custom roles stored in the options table.  That might be necessary
 but I'm not sure how common or vital it is.

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Ticket URL: <http://trac.wordpress.org/ticket/5541>
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