Determines whether the server is running an earlier than 1.5.0 version of lighttpd.

function is_lighttpd_before_150() {
	$server_parts    = explode( '/', isset( $_SERVER['SERVER_SOFTWARE'] ) ? $_SERVER['SERVER_SOFTWARE'] : '' );
	$server_parts[1] = isset( $server_parts[1] ) ? $server_parts[1] : '';

	return ( 'lighttpd' === $server_parts[0] && -1 == version_compare( $server_parts[1], '1.5.0' ) );
}