[wp-trac] [WordPress Trac] #20412: add_query_arg() doesn't work with already exisitng CGI vars

[WordPress Trac]

#20412: add_query_arg() doesn't work with already exisitng CGI vars
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 Reporter:  porton        |      Owner:
     Type:  defect (bug)  |     Status:  new
 Priority:  normal        |  Milestone:  Awaiting Review
Component:  General       |    Version:  3.3.1
 Severity:  normal        |   Keywords:
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 add_query_arg('filter', '125', '/project/?lang=en') returns
 /project/?lang=en&filter=125?lang=en (with two lang=en).

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Ticket URL: <http://core.trac.wordpress.org/ticket/20412>
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