id	summary	reporter	owner	description	type	status	priority	milestone	component	version	severity	resolution	keywords	cc
17923	add_query_arg() should encode values	Viper007Bond		"One (or me at least) would expect that the result of

{{{
add_query_arg( 'foobar', 'this&that', 'index.php' )
}}}

would be

{{{
index.php?foobar=this%26that
}}}

since the whole purpose of the function is to build a URL. However the actual result is

{{{
index.php?foobar=this&that
}}}

You're asking to the function to create a URL in which `foobar` is `this&that` but instead it creates a URL in which `foobar` is set to only `this`. You shouldn't have to pre-encode values -- the function should take care of it for you.

The function to ""blame"" for this is our `build_query()` which for some reason does not encode by default.

Semi-related: #16943"	defect (bug)	new	normal	Future Release	General	3.2	normal		has-patch 3.6-early	kpayne@… justin@… phill@…