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Cannot Modify Header Information Error

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When a user clicks a button in my application, it is supposed to reroute them to a certain page in my application, but instead I get the following error message: 


Cannot modify header information - headers already sent by (output started at /home/colly/public_html/myapp/ItemsController.php:218)


and here is the function inside of the itemsController that generates the error:

public function actionRedirectSomewhere($itemId) {$this->redirect(array('items/index'));}


It still gives me the same error if I call the function without the parameter like this: 

actionRedirectSomewhere() {$this->redirect(array('items/index'));}


I am not aware of any headers that I am sending.


How can I fix this error?

Any help would be appreciated.



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What is line 218 of ItemsController.php? It's not a matter of sending headers that's causing the problem exactly, it's that the browser has already received some data, such as HTML or even a blank space, which means the redirect cannot occur. 

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Here is line 218: public function actionRedirectSomewhere($itemId) {$this->redirect(array('items/index'));}


It's the function call with the redirect statement. You were right. I was getting this error because I omitted the closing php tag at the end of the ItemsController. I was told I should do that  (omitting closing php tags) but did not understand when, why and where I should omit this ?> if at all.

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