As before in http://www.scriptcase.net/forum/showthread.php?2708-How-to-properly-connect-to-oracle&highlight=oracle
in order to properly connect to oracle (full client) just follow that guide. It also seems to work fine in our case for oracle 10g combined with scriptcase 8.
Oracle 11 full client should work similarly.
So edit: httpd.conf, prepend your oracle bin dir :
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FcgidInitialEnv PATH "c:\oracle\ora10g\bin;C:\PROGRA~2\NetMak…
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Check if in php.ini the php_oci8 and (if needed) the php_oci8_11g.dll are installed.
If using oracle odbc then ONLY use the 32 bits version, it fails with the 64 bits version.