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The filter is the callback function added with `add_filter()`, therefore the hook passes a value to the filter, and the filter returns a value to change its behaviour. The documentation is referring to the latter. Props johnbillion. See #49572, #16557. Built from https://develop.svn.wordpress.org/trunk@48185 git-svn-id: http://core.svn.wordpress.org/trunk@47954 1a063a9b-81f0-0310-95a4-ce76da25c4cd