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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 |
|---|---|
| 390 | if ( $comment_ids && $this->query_vars['number'] && ! $this->query_vars['no_found_rows'] ) { |
| 391 | /** |
| 392 | * Filter the query used to retrieve found comment count. |
| 393 | * |
| 394 | * @since 4.4.0 |
| 395 | * |
| 396 | * @param string $found_comments_query SQL query. Default 'SELECT FOUND_ROWS()'. |
| 397 | * @param WP_Comment_Query $comment_query The `WP_Comment_Query` instance. |
| 398 | */ |
| 399 | $found_comments_query = apply_filters( 'found_comments_query', 'SELECT FOUND_ROWS()', $this ); |
| 400 | $this->found_comments = (int) $wpdb->get_var( $found_comments_query ); |
| 401 | |
| 402 | $this->max_num_pages = ceil( $this->found_comments / $this->query_vars['number'] ); |
| 403 | } |
| 404 | |
| 405 | if ( 'ids' == $this->query_vars['fields'] ) { |
| 406 | $this->comments = $comment_ids; |
| 407 | return $this->comments; |
| 408 | } |