Strange content after installing new PHP5

Question

I've installed PHP & MySQL (with PDO Driver) on my FreeBSD dedicated server, earlier I was using Debian and everything worked like a charm, but now, when I enter my website all I can see is a strange string on a white page:

Ě= AĐ~OńÚlś°źůÁ@6YbńřÎŢŰ^Źh

When I delete my whole index.php and replace it with:

<?php
     echo "Hello World";
?>

Then everything is fine.

I think its a problem with the php.ini file, as I've recently used this tutorial: http://www.howtoforge.com/firefox-content-encoding-error-google-chrome-error-330-net-err_content_decoding_failed-unknown-error

To fix the problem I had (Error 330 (net::ERR_CONTENT_DECODING_FAILED): Unknown error.).

Have you guys any ideas on what it may be?