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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 |
|---|---|
| 405 | $pieces = array( 'fields', 'join', 'where', 'orderby', 'order', 'limits', 'groupby' ); |
| 406 | /** |
| 407 | * Filter the comment query clauses. |
| 408 | * |
| 409 | * @since 3.1.0 |
| 410 | * |
| 411 | * @param array $pieces A compacted array of comment query clauses. |
| 412 | * @param WP_Comment_Query &$this Current instance of WP_Comment_Query, passed by reference. |
| 413 | */ |
| 414 | $clauses = apply_filters_ref_array( 'comments_clauses', array( compact( $pieces ), &$this ) ); |
| 415 | foreach ( $pieces as $piece ) |
| 416 | $$piece = isset( $clauses[ $piece ] ) ? $clauses[ $piece ] : ''; |
| 417 | |
| 418 | if ( $groupby ) |
| 419 | $groupby = 'GROUP BY ' . $groupby; |
| 420 | |
| 421 | $query = "SELECT $fields FROM $wpdb->comments $join WHERE $where $groupby ORDER BY $orderby $order $limits"; |
| 422 | |
| 423 | if ( $count ) |