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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 |
|---|---|
| 3137 | |
| 3138 | /** |
| 3139 | * Filter the ORDER BY clause of the comments feed query before sending. |
| 3140 | * |
| 3141 | * @since 2.8.0 |
| 3142 | * |
| 3143 | * @param string $corderby The ORDER BY clause of the query. |
| 3144 | * @param WP_Query &$this The WP_Query instance (passed by reference). |
| 3145 | */ |
| 3146 | $corderby = apply_filters_ref_array( 'comment_feed_orderby', array( 'comment_date_gmt DESC', &$this ) ); |
| 3147 | |
| 3148 | /** |
| 3149 | * Filter the LIMIT clause of the comments feed query before sending. |
| 3150 | * |
| 3151 | * @since 2.8.0 |
| 3152 | * |
| 3153 | * @param string $climits The JOIN clause of the query. |
| 3154 | * @param WP_Query &$this The WP_Query instance (passed by reference). |
| 3155 | */ |
| Line | Code |
| 3516 | |
| 3517 | /** This filter is documented in wp-includes/query.php */ |
| 3518 | $cwhere = apply_filters_ref_array( 'comment_feed_where', array( "WHERE comment_post_ID = '{$this->posts[0]->ID}' AND comment_approved = '1'", &$this ) ); |
| 3519 | |
| 3520 | /** This filter is documented in wp-includes/query.php */ |
| 3521 | $cgroupby = apply_filters_ref_array( 'comment_feed_groupby', array( '', &$this ) ); |
| 3522 | $cgroupby = ( ! empty( $cgroupby ) ) ? 'GROUP BY ' . $cgroupby : ''; |
| 3523 | |
| 3524 | /** This filter is documented in wp-includes/query.php */ |
| 3525 | $corderby = apply_filters_ref_array( 'comment_feed_orderby', array( 'comment_date_gmt DESC', &$this ) ); |
| 3526 | $corderby = ( ! empty( $corderby ) ) ? 'ORDER BY ' . $corderby : ''; |
| 3527 | |
| 3528 | /** This filter is documented in wp-includes/query.php */ |
| 3529 | $climits = apply_filters_ref_array( 'comment_feed_limits', array( 'LIMIT ' . get_option('posts_per_rss'), &$this ) ); |
| 3530 | |
| 3531 | $comments_request = "SELECT $wpdb->comments.* FROM $wpdb->comments $cjoin $cwhere $cgroupby $corderby $climits"; |
| 3532 | $this->comments = $wpdb->get_results($comments_request); |
| 3533 | $this->comment_count = count($this->comments); |
| 3534 | } |