[wp-trac] [WordPress Trac] #19243: Introduce WP_Query::exists(), or have WP_Query::get() return false for non-existence

[WordPress Trac]

#19243: Introduce WP_Query::exists(), or have WP_Query::get() return false for non-
existence
-------------------------+-----------------------------
 Reporter:  nacin        |      Owner:
     Type:  enhancement  |     Status:  new
 Priority:  normal       |  Milestone:  Awaiting Review
Component:  Query        |    Version:
 Severity:  normal       |   Keywords:
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 See [ticket:15178#comment:8].

 A query variable for an an endpoint with no value (/blah/, rather than
 /feed/rss2/) is set, but it is empty. WP_Query::get() returns an empty
 string when no QV is set, though, so you need to dig into
 WP_Query::query_vars directly. This is annoying. It should return false
 when the QV is not existence.

 This should be rather backwards compatible, but WP_Query::exists() may be
 desired (also, or instead of). In this case, it won't work for core query
 vars, as _fill_query_vars() clears these, rather than unsets them. We
 should either change how _fill_query_vars() works, or something.

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Ticket URL: <http://core.trac.wordpress.org/ticket/19243>
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