[wp-trac] [WordPress Trac] #16471: Support default values for non-existant query vars in get_query_var() et al

[WordPress Trac]

#16471: Support default values for non-existant query vars in get_query_var() et al
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 Reporter:  hakre        |       Owner:
     Type:  enhancement  |      Status:  new
 Priority:  normal       |   Milestone:  Awaiting Review
Component:  General      |     Version:  3.0
 Severity:  normal       |  Resolution:
 Keywords:  has-patch    |
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Comment (by nacin):

 Interesting. We've discussed this before, in #15178, then in #19243. I
 never saw this ticket, but it turns out it is probably the best immediate
 solution. I'd prefer to change the return value to `false` from `''` (as
 stated in #15178) but I feel like that could break things. exists() would
 be nice too but this would be an immediate thing.

 Part of the issue found in #19243 is that fill_query_vars() sets a bunch
 of query variables to `''`. This is in part due to the ability to call
 parse_query() and get_posts() more than once in a single WP_Query instance
 (which is weird, nonetheless), so there needs to be some reset. The issue
 here would be that a $default of something other than `''` would never be
 hit for a default "filled" query variable. Which is why this isn't a
 straight commit. But I'd love to resolve it.

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Ticket URL: <http://core.trac.wordpress.org/ticket/16471#comment:5>
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