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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 |
|---|---|
| 2243 | $found_rows = 'SQL_CALC_FOUND_ROWS'; |
| 2244 | |
| 2245 | $this->request = " SELECT $found_rows $distinct $fields FROM $wpdb->posts $join WHERE 1=1 $where $groupby $orderby $limits"; |
| 2246 | if ( !$q['suppress_filters'] ) |
| 2247 | $this->request = apply_filters('posts_request', $this->request); |
| 2248 | |
| 2249 | $this->posts = $wpdb->get_results($this->request); |
| 2250 | // Raw results filter. Prior to status checks. |
| 2251 | if ( !$q['suppress_filters'] ) |
| 2252 | $this->posts = apply_filters('posts_results', $this->posts); |
| 2253 | |
| 2254 | if ( !empty($this->posts) && $this->is_comment_feed && $this->is_singular ) { |
| 2255 | $cjoin = apply_filters('comment_feed_join', ''); |
| 2256 | $cwhere = apply_filters('comment_feed_where', "WHERE comment_post_ID = '{$this->posts[0]->ID}' AND comment_approved = '1'"); |
| 2257 | $cgroupby = apply_filters('comment_feed_groupby', ''); |
| 2258 | $cgroupby = ( ! empty( $cgroupby ) ) ? 'GROUP BY ' . $cgroupby : ''; |
| 2259 | $corderby = apply_filters('comment_feed_orderby', 'comment_date_gmt DESC'); |
| 2260 | $corderby = ( ! empty( $corderby ) ) ? 'ORDER BY ' . $corderby : ''; |
| 2261 | $climits = apply_filters('comment_feed_limits', 'LIMIT ' . get_option('posts_per_rss')); |