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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 |
|---|---|
| 2213 | |
| 2214 | $orderby = $q['orderby']; |
| 2215 | |
| 2216 | // Apply post-paging filters on where and join. Only plugins that |
| 2217 | // manipulate paging queries should use these hooks. |
| 2218 | if ( !$q['suppress_filters'] ) { |
| 2219 | $where = apply_filters('posts_where_paged', $where); |
| 2220 | $groupby = apply_filters('posts_groupby', $groupby); |
| 2221 | $join = apply_filters('posts_join_paged', $join); |
| 2222 | $orderby = apply_filters('posts_orderby', $orderby); |
| 2223 | $distinct = apply_filters('posts_distinct', $distinct); |
| 2224 | $limits = apply_filters( 'post_limits', $limits ); |
| 2225 | |
| 2226 | $fields = apply_filters('posts_fields', $fields); |
| 2227 | } |
| 2228 | |
| 2229 | // Announce current selection parameters. For use by caching plugins. |
| 2230 | do_action( 'posts_selection', $where . $groupby . $orderby . $limits . $join ); |
| 2231 | |