As of WP version 2.5, this hook has been renamed to where.
In function get_previous_post (which finds the post before the currently-displayed post), applied to the SQL WHERE clause (which normally looks for the previous dated published post). Filter function arguments: WHERE clause, stay in same category (true/false), list of excluded categories.
This database has information for all major versions from WP 1.2.1 through 3.5.
|2.1||wp-includes/link-template.php||300||View hook in source||filter|
|2.2||wp-includes/link-template.php||344||View hook in source||filter|
|2.3||wp-includes/link-template.php||385||View hook in source||filter|
|2.5||Renamed. See where|
We find related hooks using word stems. get_previous_post_where has 3 significant word stem(s):
where. Note that some of the hooks below may not appear in all versions of WP.