WP_Theme::is_allowed( string $check = ‘both’, int $blog_id = null ): bool

Source

public function is_allowed( $check = 'both', $blog_id = null ) {
	if ( ! is_multisite() ) {
		return true;
	}

	if ( 'both' === $check || 'network' === $check ) {
		$allowed = self::get_allowed_on_network();
		if ( ! empty( $allowed[ $this->get_stylesheet() ] ) ) {
			return true;
		}
	}

	if ( 'both' === $check || 'site' === $check ) {
		$allowed = self::get_allowed_on_site( $blog_id );
		if ( ! empty( $allowed[ $this->get_stylesheet() ] ) ) {
			return true;
		}
	}

	return false;
}

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