PHP Exit; does not work

I'm working on 开发者_如何学Ca client's server and am finding the strangest things..

echo 7;

does not output 7.

echo "hello";

outputs hello.

and the exit; command does not work.

He's running 5.2.13 and Apache 2.0 Handler and has the Zend handler installed...

Anyone have any clue what might be going on?

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this might sound stupid, but maybe phpinfo(); could give some hints?