Description:
------------
In the documentation : "Remember that header() must be called before any actual output is sent..."
We can find the same in setcookie() function.

In PHP5, when we use
header("Location: http://www.lookstrike.com");
, the function doen't care if we sent something before.

If other function exists like that, perhaps it will do the same thing...

php.ini file : 
display_error = On
error_reporting = E_ALL

I don't know if you have to clarify the docs or if it is a function bug...

Reproduce code:
---------------
<?php
echo "A";
header("Location: http://www.lookstrike.com"); // Going to Website
?>

of

<?php
echo "A";
setcookie("TEST"); // No error
?>