output buffer question

[Liquid Fire]

I am trying to create a function that will redirect the the page whether or not the output buffer has started.  so my function was

 

ob_clean()

header('location: ' . $url);

 

however if the output buffer has nothing in it, ob_clean return a warning which then in turn starts the buffer and now my redirect will not work.  I want to make sure this function works if warning are turn on in the php config so id there a way to see if the output buffer has started?  both substr(ob_get_contents()) and ob_get_length() are not returning me anything so any help would be great.

[Liquid Fire]

i am all set.