WordPress at a glance
function is not described

WP_Query::is_archive() public WP 3.1.0

Is the query for an existing archive page?

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

It's a method of the class: WP_Query{}

No Hooks.

Return

true/false. Whether the query is for an existing archive page.

Usage

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

Changelog

Since 3.1.0 Introduced.

Code of WP_Query::is_archive() WP 5.5.1

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