Boone Gorges 8b15f8be3d In Walker_CategoryDropdown::start_el(), cast values to strings before deciding whether to append 'selected' attribute. ...

As of [32484], `wp_dropdown_categories()` uses the `$value_field` value to
decide whether a given `<option>` should be 'selected'. However, `$value_field`
can refer to a value that is a string, such as a category's slug. This causes
problems when doing a loose comparison (`==`) with the value of the `'selected'`
parameter, which defaults to `0`, because when doing a loose comparison
between an integer and a string, PHP will cast the string to an integer. This
creates false matches, resulting in `<option>` elements getting a 'selected'
attribute incorrectly.

We address the issue by casting the comparison values to strings, and then
using the strict comparison operator `===`.

Fixes #33452 for trunk.
Built from https://develop.svn.wordpress.org/trunk@33681


git-svn-id: http://core.svn.wordpress.org/trunk@33648 1a063a9b-81f0-0310-95a4-ce76da25c4cd

2015-08-21 01:11:26 +00:00

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