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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 |
---|---|
2628 |
|
2629 | /** |
2630 | * Filters the ORDER BY clause of the comments feed query before sending. |
2631 | * |
2632 | * @since 2.8.0 |
2633 | * |
2634 | * @param string $corderby The ORDER BY clause of the query. |
2635 | * @param WP_Query $this The WP_Query instance (passed by reference). |
2636 | */ |
2637 | $corderby = apply_filters_ref_array( 'comment_feed_orderby', array( 'comment_date_gmt DESC', &$this ) ); |
2638 |
|
2639 | /** |
2640 | * Filters the LIMIT clause of the comments feed query before sending. |
2641 | * |
2642 | * @since 2.8.0 |
2643 | * |
2644 | * @param string $climits The JOIN clause of the query. |
2645 | * @param WP_Query $this The WP_Query instance (passed by reference). |
2646 | */ |
Line | Code |
3044 |
|
3045 | /** This filter is documented in wp-includes/query.php */ |
3046 | $cwhere = apply_filters_ref_array( 'comment_feed_where', array( "WHERE comment_post_ID = '{$this->posts[0]->ID}' AND comment_approved = '1'", &$this ) ); |
3047 |
|
3048 | /** This filter is documented in wp-includes/query.php */ |
3049 | $cgroupby = apply_filters_ref_array( 'comment_feed_groupby', array( '', &$this ) ); |
3050 | $cgroupby = ( ! empty( $cgroupby ) ) ? 'GROUP BY ' . $cgroupby : ''; |
3051 |
|
3052 | /** This filter is documented in wp-includes/query.php */ |
3053 | $corderby = apply_filters_ref_array( 'comment_feed_orderby', array( 'comment_date_gmt DESC', &$this ) ); |
3054 | $corderby = ( ! empty( $corderby ) ) ? 'ORDER BY ' . $corderby : ''; |
3055 |
|
3056 | /** This filter is documented in wp-includes/query.php */ |
3057 | $climits = apply_filters_ref_array( 'comment_feed_limits', array( 'LIMIT ' . get_option( 'posts_per_rss' ), &$this ) ); |
3058 |
|
3059 | $comments_request = "SELECT {$wpdb->comments}.* FROM {$wpdb->comments} $cjoin $cwhere $cgroupby $corderby $climits"; |
3060 | $comments = $wpdb->get_results( $comments_request ); |
3061 | // Convert to WP_Comment. |
3062 | $this->comments = array_map( 'get_comment', $comments ); |