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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 |
|---|---|
| 314 | } |
| 315 | if ( '' !== $parent ) |
| 316 | $where .= $wpdb->prepare( ' AND comment_parent = %d', $parent ); |
| 317 | if ( '' !== $user_id ) |
| 318 | $where .= $wpdb->prepare( ' AND user_id = %d', $user_id ); |
| 319 | if ( '' !== $search ) |
| 320 | $where .= $this->get_search_sql( $search, array( 'comment_author', 'comment_author_email', 'comment_author_url', 'comment_author_IP', 'comment_content' ) ); |
| 321 | |
| 322 | $pieces = array( 'fields', 'join', 'where', 'orderby', 'order', 'limits' ); |
| 323 | $clauses = apply_filters_ref_array( 'comments_clauses', array( compact( $pieces ), &$this ) ); |
| 324 | foreach ( $pieces as $piece ) |
| 325 | $$piece = isset( $clauses[ $piece ] ) ? $clauses[ $piece ] : ''; |
| 326 | |
| 327 | $query = "SELECT $fields FROM $wpdb->comments $join WHERE $where ORDER BY $orderby $order $limits"; |
| 328 | |
| 329 | if ( $count ) |
| 330 | return $wpdb->get_var( $query ); |
| 331 | |
| 332 | $comments = $wpdb->get_results( $query ); |