Introduce is_child()

[McGurk]

I've been thinking of a new conditional tag named is_child() which will function in the same way as is_page() but it will tell the user if the current page is a child of the parent page specified as a argument, either by a ID, slug or a title. This could of course be a single value or an array.

I think that many would like and find a function like this useful, I know that I would and it would be perfect when developing a CMS using Wordpress and you need to add something to all child pages.

#8050

http://core.trac.wordpress.org/search?q=is_child