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The best way to understand what a hook does is to look at where it occurs in the source code.
do_action( "hook_name" )
apply_filters( "hook_name", "what_to_filter" )
.Remember, this hook may occur in more than one file. Moreover, the hook's context may change from version to version.
Line | Code |
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1239 | $where = "AND 0"; |
1240 | } |
1241 |
|
1242 | // Apply post-paging filters on where and join. Only plugins that |
1243 | // manipulate paging queries should use these hooks. |
1244 |
|
1245 | // Announce current selection parameters. For use by caching plugins. |
1246 | do_action( 'posts_selection', $where . $groupby . $q['orderby'] . $limits . $join ); |
1247 |
|
1248 | $where = apply_filters('posts_where_paged', $where); |
1249 | $groupby = apply_filters('posts_groupby', $groupby); |
1250 | if ( ! empty($groupby) ) |
1251 | $groupby = 'GROUP BY ' . $groupby; |
1252 | $join = apply_filters('posts_join_paged', $join); |
1253 | $orderby = apply_filters('posts_orderby', $q['orderby']); |
1254 | if ( !empty( $orderby ) ) |
1255 | $orderby = 'ORDER BY ' . $orderby; |
1256 | $distinct = apply_filters('posts_distinct', $distinct); |
1257 | $fields = apply_filters('posts_fields', "$wpdb->posts.*"); |