Displays an access denied message when a user tries to view a site’s dashboard they
do not have access to.

function _access_denied_splash() {
	if ( ! is_user_logged_in() || is_network_admin() ) {
		return;
	}

	$blogs = get_blogs_of_user( get_current_user_id() );

	if ( wp_list_filter( $blogs, array( 'userblog_id' => get_current_blog_id() ) ) ) {
		return;
	}

	$blog_name = get_bloginfo( 'name' );

	if ( empty( $blogs ) ) {
		wp_die(
			sprintf(
				/* translators: 1: Site title. */
				__( 'You attempted to access the "%1$s" dashboard, but you do not currently have privileges on this site. If you believe you should be able to access the "%1$s" dashboard, please contact your network administrator.' ),
				$blog_name
			),
			403
		);
	}

	$output = '
' . sprintf(
		/* translators: 1: Site title. */
		__( 'You attempted to access the "%1$s" dashboard, but you do not currently have privileges on this site. If you believe you should be able to access the "%1$s" dashboard, please contact your network administrator.' ),
		$blog_name
	) . '
';
	$output .= '
' . __( 'If you reached this screen by accident and meant to visit one of your own sites, here are some shortcuts to help you find your way.' ) . '
';

	$output .= '
' . __( 'Your Sites' ) . '
';
	$output .= '

foreach ( $blogs as $blog ) {
$output .= ‘

“;
$output .= ‘

‘;
$output .= ‘

‘;
}

$output .= ‘

‘;

wp_die( $output, 403 );
}