PHP + headers

Anon

Please, a little help.
I know I can't send a header when some char was sent to browser, ok. So I want send the header just if there is no char sent to browser. Can I do this? Or will I need to hide the warning messages?

Thanks

terje-s

Um, if you need to determine whether or not your own webpage has outputted any data, its more or less a sign of sloppy coding. I don't think there is any 'straightforward' way to do this -- except you could write a print() wrapper that counted chars printed.. But then again, all data would have to be outputted with this print wrapper for it to work correctly,..

You could always attempt to solve your problems with javascript or meta-tags outputted instead of a header - e.g. print <script>location('http://www.test.com');</script> instead of actually doing header("Location: http://www.test.com");.. But if you need more practical information, you're going to have to tell me why you have to test whether or not you have outputted data.. because all header() stuff should be done before even thinking about outputting anything else.. =b

Anon

Actually you could turn on "output buffering". That would save up all output, pickes out the headers and sends everything in the correct order.
IOt also slows down your script. Oh, and indeed it is a workaround for sloppy code.

Anon

Hi Terje,
Well, I will explain you. In my system I have 2 kinds of layout. A normal layout and a popup. I need make a header("Pragma: no-cache") just in the popups.
Well, I can pass a flag to popup, but there are about 50 different popups, and just NOW i've noted I gotta do this.

All my popups do this:

<?PHP
include ("x.php");
...........

And the normal layouts do this:

<?PHP
include ("c.php");
include ("x.php");
...........

I will put the header("Pragma: no-cache") in x.php.

x.php:
<?PHP
isset($flag) or header("Pragma: no-cache");
................

But before this line I was thinking do somethig like:
$flag = it_was_any_char_sent();

I know it is a little confuse. Sorry. I hope you understand.

Thanks!

Anon

You could use the headers_sent() function.