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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.
This hook occurs 2 times in this file.
| Line | Code |
|---|---|
| 2174 | $cwhere = "WHERE comment_approved = '1' $where"; |
| 2175 | $cgroupby = "$wpdb->comments.comment_id"; |
| 2176 | } else { // Other non singular e.g. front |
| 2177 | $cjoin = "JOIN $wpdb->posts ON ( $wpdb->comments.comment_post_ID = $wpdb->posts.ID )"; |
| 2178 | $cwhere = "WHERE post_status = 'publish' AND comment_approved = '1'"; |
| 2179 | $cgroupby = ''; |
| 2180 | } |
| 2181 | |
| 2182 | if ( !$q['suppress_filters'] ) { |
| 2183 | $cjoin = apply_filters('comment_feed_join', $cjoin); |
| 2184 | $cwhere = apply_filters('comment_feed_where', $cwhere); |
| 2185 | $cgroupby = apply_filters('comment_feed_groupby', $cgroupby); |
| 2186 | $corderby = apply_filters('comment_feed_orderby', 'comment_date_gmt DESC'); |
| 2187 | $climits = apply_filters('comment_feed_limits', 'LIMIT ' . get_option('posts_per_rss')); |
| 2188 | } |
| 2189 | $cgroupby = ( ! empty( $cgroupby ) ) ? 'GROUP BY ' . $cgroupby : ''; |
| 2190 | $corderby = ( ! empty( $corderby ) ) ? 'ORDER BY ' . $corderby : ''; |
| 2191 | |
| 2192 | $this->comments = (array) $wpdb->get_results("SELECT $distinct $wpdb->comments.* FROM $wpdb->comments $cjoin $cwhere $cgroupby $corderby $climits"); |
| Line | Code |
| 2246 | if ( !$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')); |
| 2262 | $comments_request = "SELECT $wpdb->comments.* FROM $wpdb->comments $cjoin $cwhere $cgroupby $corderby $climits"; |
| 2263 | $this->comments = $wpdb->get_results($comments_request); |
| 2264 | $this->comment_count = count($this->comments); |