Question

I think most of us know about the infamous “Headers already sent” error in PHP. Can I check someway if headers already have been sent?

It would be really handy to do such, before going all out with trying to set some SESSION data or similar.

Thanks!

Answer 1

PHP has a function headers_sent() which allows you to check if the headers are already sent out before you take any action. Here’s how you could use the function in your code:

if(headers_sent())
{ //if headers already sent out print some message.
echo "Please go to yahoo.com";
}
else{
//send the user automatically to test.php
header('Location: http://yahoo.com');
exit;
}