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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 |
|---|---|
| 370 | $groupby = "{$wpdb->comments}.comment_ID"; |
| 371 | } |
| 372 | |
| 373 | if ( ! empty( $date_query ) && is_array( $date_query ) ) { |
| 374 | $date_query_object = new WP_Date_Query( $date_query, 'comment_date' ); |
| 375 | $where .= $date_query_object->get_sql(); |
| 376 | } |
| 377 | |
| 378 | $pieces = array( 'fields', 'join', 'where', 'orderby', 'order', 'limits', 'groupby' ); |
| 379 | $clauses = apply_filters_ref_array( 'comments_clauses', array( compact( $pieces ), &$this ) ); |
| 380 | foreach ( $pieces as $piece ) |
| 381 | $$piece = isset( $clauses[ $piece ] ) ? $clauses[ $piece ] : ''; |
| 382 | |
| 383 | if ( $groupby ) |
| 384 | $groupby = 'GROUP BY ' . $groupby; |
| 385 | |
| 386 | $query = "SELECT $fields FROM $wpdb->comments $join WHERE $where $groupby ORDER BY $orderby $order $limits"; |
| 387 | |
| 388 | if ( $count ) |