Jonny Harris eb6bf15bc7 Posts, Post Types: Use WP_Query internally in get_pages.
Convert `get_pages` to use `WP_Query` internally. Using WP_Query means that a lot of code has been removed however existing parameters supported by get_pages are transformed in to query arguments. The custom caching solution found in the old version of this function is replaced with the caching found in WP_Query (added in [53941]). This change adds consistency to the codebase, as improvements and changes to `WP_Query` will filter down to the `get_pages` function. 

Props mikeschinkel, spacedmonkey, nacin, scribu, filosofo, jane, garyc40, markoheijnen, grandslambert, kevinB, wlindley, dbernar1, atimmer, mdawaffe, helen, benjibee, johnbillion, peterwilsoncc, costdev, flixos90, joemcgill.
Fixes #12821.

git-svn-id: https://develop.svn.wordpress.org/trunk@55569 602fd350-edb4-49c9-b593-d223f7449a82
2023-03-21 12:47:20 +00:00
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