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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 | 
|---|---|
| 2204 |  | 
| 2205 |           $orderby = $q['orderby']; | 
| 2206 |  | 
| 2207 |           // Apply post-paging filters on where and join.  Only plugins that | 
| 2208 |           // manipulate paging queries should use these hooks. | 
| 2209 |           if ( !$q['suppress_filters'] ) { | 
| 2210 |                $where = apply_filters('posts_where_paged', $where); | 
| 2211 |                $groupby = apply_filters('posts_groupby', $groupby); | 
| 2212 |                $join = apply_filters('posts_join_paged', $join); | 
| 2213 |                $orderby = apply_filters('posts_orderby', $orderby); | 
| 2214 |                $distinct = apply_filters('posts_distinct', $distinct); | 
| 2215 |                $limits = apply_filters( 'post_limits', $limits ); | 
| 2216 |  | 
| 2217 |                if ( ! empty($q['meta_key']) ) | 
| 2218 |                     $fields = "$fields, $wpdb->postmeta.meta_value"; | 
| 2219 |  | 
| 2220 |                $fields = apply_filters('posts_fields', $fields); | 
| 2221 |           } | 
| 2222 |  |