Boone Gorges 2d737796d2 Improve support for ordering WP_Query results by postmeta.
`WP_Meta_Query` clauses now support a 'name' parameter. When building a
`WP_Query` object, the value of 'orderby' can reference this 'name', so that
it's possible to order by any clause in a meta_query, not just the first one
(as when using 'orderby=meta_value'). This improvement also makes it possible
to order by multiple meta query clauses (or by any other eligible field plus
a meta query clause), using the array syntax for 'orderby' introduced in [29027].

Props Funkatronic, boonebgorges.
Fixes #31045.

git-svn-id: https://develop.svn.wordpress.org/trunk@31312 602fd350-edb4-49c9-b593-d223f7449a82
2015-01-31 15:47:51 +00:00
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