use \Liaosp\Express\Express
$obj = new Express()

$obj->number('75355662900611'); //默认百度快递，其他快递貌似没啥用了

$obj->setExpress('kuaidi100');
$obj->number('71291609210123'); 

$obj->setExpress('kuaidi100');
$obj->setExpress('ickd');
$obj->number('71291609210123'); 

$obj->addChannel('kuaidiwang',/yournamespace/KuaidiWang::class);
$obj->setExpress('kuaidiwang');
$obj->number('71291609210123');