WP_Query::is_archive() WP 3.1.0

Is the query for an existing archive page?

Month, Year, Category, Author, Post Type archive...

This is a method of the class: WP_Query

No Hooks.

Return

true/false.

Usage

$WP_Query = new WP_Query();
$var = $WP_Query->is_archive();

Code of WP Query::is archive: wp-includes/class-wp-query.php ^{WP 5.2}

<?php
public function is_archive() {
	return (bool) $this->is_archive;
}