id	summary	reporter	owner	description	type	status	priority	milestone	component	version	severity	resolution	keywords	cc
23519	esc_url() mangles array format query variables in URLs	johnbillion		"`http://example.com/?test[foo]=bar` is a valid URL, but `esc_url()` mangles it into `http://example.com/?testfoo=bar`.

To reproduce:

{{{
$url = 'http://example.com/?test[foo]=bar';

echo '<pre>';
var_dump( $url );
var_dump( esc_url( $url ) );
echo '</pre>';
}}}

Also affects array format query variables without named keys, eg. `foo[]=bar`.

Tested back to 3.4. May affect earlier versions."	defect (bug)	closed	normal		Formatting	3.4	normal	duplicate