Add disabled() form helper

[nacin]

We should add disabled() as a form helper to echo ' disabled="disabled"'.

We should also consider moving selected(), checked(), and disabled() (and the helper function) into wp-includes/general-template.php, out of wp-admin/includes/template.php, as a plugin author may find use for them outside of wp-admin.

readonly() wouldn't be a bad idea either, though usually that isn't based on a condition (and we never use it conditionally in core).

Replying to nacin:

We should add disabled() as a form helper to echo ' disabled="disabled"'.

+1

We should also consider moving selected(), checked(), and disabled() (and the helper function) into wp-includes/general-template.php, out of wp-admin/includes/template.php, as a plugin author may find use for them outside of wp-admin.

+1.5 :)

(In [13658]) Introduce the disabled() form helper. Move selected() and checked() out of wp-admin and into full scope. see #12581

(In [13661]) Use disabled() form helper. fixes #12581

(In [13662]) Fix logic and pull static code out of a loop. fixes #12581

(In [13663]) Simplify hackish logic. props miqrogroove. fixes #12581

Related: #12598