WordPress at a glance
function is not described

WP_Theme::get_allowed_on_network() public WP 3.4.0

Returns array of stylesheet names of themes allowed on the network.

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

Hooks from the method
Return

String[]. Array of stylesheet names.

Usage

$result = WP_Theme::get_allowed_on_network();

Changelog

Since 3.4.0 Introduced.

Code of WP_Theme::get_allowed_on_network() WP 5.5.1

<?php
public static function get_allowed_on_network() {
	static $allowed_themes;
	if ( ! isset( $allowed_themes ) ) {
		$allowed_themes = (array) get_site_option( 'allowedthemes' );
	}

	/**
	 * Filters the array of themes allowed on the network.
	 *
	 * @since MU (3.0.0)
	 *
	 * @param string[] $allowed_themes An array of theme stylesheet names.
	 */
	$allowed_themes = apply_filters( 'allowed_themes', $allowed_themes );

	return $allowed_themes;
}