Daniel Convissor wrote:
Folks:
On Tue, Feb 05, 2008 at 08:11:24PM -0500, Dan Cech wrote:
chad qian wrote:
Warning: session_start() [function.session-start]: Cannot send
session cache limiter - headers already sent (output started at
/home/getatwoq/public_html/chad/registrationverified.php:3) in
/home/getatwoq/public_html/chad/inc/prehtml.php on line 23
Personally, I've been ignoring this thread. The error message PHP
produces is completely clear about what and where the problem is. But
Dan, who's pretty good about stuff, posted, and I was curious about what
drew him into the fray. I've got to disagree with a few things he said.
The output is being started on line 23 of prehtml.php.
Actually, the error message says "output started at...
registrationverified.php:3." The ":3" means line 3. That aside,
My bad, it had been a long day.
Odds are fairly
good that this file is 23 lines long and the end of the file looks like
this:
?>[\n]
That trailing newline after the closing PHP tag is causing output to
start and resulting in the error message above.
Nope. PHP is okay with one line break after the ?>, but not two.
Fair enough, the gist of the argument is that it is easy to end up with
an additional trailing newline that isn't immediately obvious in most
editors (I run with newline and tab marks turned on which would show
this up) and can cause massive problems.
2. End the file with a comment, like:
// end of file[\n]
I agree it's much cleaner to not include the closing ?> at the end of the
file. But putting a comment about it being the end of the file is
completely supurfluous. The end of the file is the end of the file.
There are many reasons for adding a comment at the end of the file, but
the single biggest one is to prevent the situation where some helpful
developer looks at the file and says "Hey, they forgot a closing ?> tag
here". They then add the tag and maybe a couple trailing newlines for
good measure. Hey presto, broken sessions and header redirects.
Dan
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