WordPress at a glance
function is not described

WP_Query::is_favicon() WP 5.4.0

Is the query for the favicon.ico file?

This is a method of the class: WP_Query

No Hooks.

Return

true/false.

Usage

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

Changelog

Since 5.4.0 Introduced.

Code of WP Query::is favicon: wp-includes/class-wp-query.php WP 5.4.2

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