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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 |
|---|---|
| 326 | |
| 327 | $post_fields = array_filter( compact( array( 'post_author', 'post_name', 'post_parent', 'post_status', 'post_type', ) ) ); |
| 328 | if ( ! empty( $post_fields ) ) { |
| 329 | $join = "JOIN $wpdb->posts ON $wpdb->posts.ID = $wpdb->comments.comment_post_ID"; |
| 330 | foreach( $post_fields as $field_name => $field_value ) |
| 331 | $where .= $wpdb->prepare( " AND {$wpdb->posts}.{$field_name} = %s", $field_value ); |
| 332 | } |
| 333 | |
| 334 | $pieces = array( 'fields', 'join', 'where', 'orderby', 'order', 'limits' ); |
| 335 | $clauses = apply_filters_ref_array( 'comments_clauses', array( compact( $pieces ), &$this ) ); |
| 336 | foreach ( $pieces as $piece ) |
| 337 | $$piece = isset( $clauses[ $piece ] ) ? $clauses[ $piece ] : ''; |
| 338 | |
| 339 | $query = "SELECT $fields FROM $wpdb->comments $join WHERE $where ORDER BY $orderby $order $limits"; |
| 340 | |
| 341 | if ( $count ) |
| 342 | return $wpdb->get_var( $query ); |
| 343 | |
| 344 | $comments = $wpdb->get_results( $query ); |