Talk:Installing Oracle for PHP
From MoodleDocs
Aside from the Encoding problems, the link provided in the article puts the pickle in the jar.
Encoding Woes
Using the Zend provided packaged install of Apache+PHP, I found it was needed to hack a bit to get the environment with the correct $NLS_LANG. (This can be done by editing the provided {ZENDHOME}/apache2/bin/apachectl, or in an rc script - ymmv if not using the Zend packaged PHP5+Apache2).
Best to set NLS_LANG=$($ORACLE_HOME/bin/nls_lang.sh), so your web server just takes it from whatever Oracle decides it should be. In my locale the default happens to be "AMERICAN_AMERICA.AL32UTF8".