一个contoller CustomerController里怎么调用另一个controller里的action，Acontoller调用SiteContoller的actionShow($id), url显示上是Customer/index

$control=Yii::app()->runController('site/show/id/2');

不带参数的actionShow()

$control=Yii::app()->runController('site/show');

redirect使用方法

$this->redirect(array('/site/contact','id'=>12));

//http://www.localyii.com/testwebap/index.php?r=site/contact&id=12

$this->redirect(array('site/contact','id'=>'idv','name'=>'namev'));

//http://www.localyii.com/testwebap/index.php?r=site/contact&id=idv&name=namev

$this->redirect(array('site/contact','v1','v2','v3'));

//http://www.localyii.com/testwebap/index.php?r=site/contact&0=v1&1=v2&2=v3

$this->redirect(array('site/contact','v1','v2','v3','#'=>'ttt'));

//带anchor的 http://www.localyii.com/testwebap/index.php?r=site/contact&0=v1&1=v2&2=v3#ttt

跳转到一个绝对路径

$this->redirect('http://www.baidu.com');

更多：
http://blog.csdn.net/qmhball/article/details/8031833