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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 |
|---|---|
| 407 | if ( $comment_ids && $this->query_vars['number'] && ! $this->query_vars['no_found_rows'] ) { |
| 408 | /** |
| 409 | * Filter the query used to retrieve found comment count. |
| 410 | * |
| 411 | * @since 4.4.0 |
| 412 | * |
| 413 | * @param string $found_comments_query SQL query. Default 'SELECT FOUND_ROWS()'. |
| 414 | * @param WP_Comment_Query $comment_query The `WP_Comment_Query` instance. |
| 415 | */ |
| 416 | $found_comments_query = apply_filters( 'found_comments_query', 'SELECT FOUND_ROWS()', $this ); |
| 417 | $this->found_comments = (int) $wpdb->get_var( $found_comments_query ); |
| 418 | |
| 419 | $this->max_num_pages = ceil( $this->found_comments / $this->query_vars['number'] ); |
| 420 | } |
| 421 | |
| 422 | if ( 'ids' == $this->query_vars['fields'] ) { |
| 423 | $this->comments = $comment_ids; |
| 424 | return $this->comments; |
| 425 | } |