Add "class" argument to "wp_dropdown_pages()"

[ramiy]

I've created a plugin that is using wp_dropdown_pages() function to show a <select> box with all the site pages.

The next step was to create a sidebar widget with a few <select> box's and a page dropdown. Now, in order to give my widget a smote WordPress style i use class="widefat". But wp_dropdown_pages() don't accept "class" argument, so my widget have a few full-wide select boxes and one regular select box.

I would like to be able to add classes to wp_dropdown_pages(). By the way, wp_dropdown_categories() and wp_dropdown_users() both accept "class" argument.

This is a simple fix. I'm attaching a patch.

[voldemortensen]

Updated patch to coding standards and to make code more readable.

[leec87]

Along these lines, is it possible to also add an anchor argument in the array, to append an anchor tag to the end of the values?

[leec87]

What's holding this up being included in the next update?

I've just had to re-edit my existing code (I've already applied this patch once).

[boonebgorges]

Change looks fine, though I'm going to modify it slightly so that an empty string for class doesn't generate an empty "class" attribute - this might mess with people using the 'wp_dropdown_pages' filter.

[boonebgorges]

In 32727:

Introduce class argument to wp_dropdown_pages().

This new argument allows devs to specify the 'class' attribute of the select
element.

Props ramiy, voldemortensen.
Fixes #30082.