Description:
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When oci_connect() uses OCI_SYSDBA or OCI_SYSOPER, oci8.c always calls
OCISessionBegin() with OCI_CRED_EXT.  This needs to be changed to
OCI_CRED_RDBMS in some cases so privileged connections can be
authenticated by an Oracle password file.

When OCI_SYSDBA or OCI_SYSOPER are specified:
    if the username is "/" and there is no password then
	the credential should be OCI_CRED_EXT
    else
	the credential should be OCI_CRED_RDBMS

There are two success cases of interest:

Case 1: oci8.c should use OCI_CRED_EXT.

  Connect succeds if the process running PHP is in Oracle's OS dba
  group and the DB is "local" i.e on the same host and specified by
  ORACLE_SID environment variable.  Otherwise connection will fail.

      oci_connect("/", "", NULL, OCI_SYSDBA);

Case 2: oci8.c should use OCI_CRED_RDBMS.

  Connect succeeds if the user is in Oracle's password file.  The DB
  can be on a remote host.

      // Note DB name could be NULL.
      oci_connect("un", "pw", "MYSID", OCI_SYSDBA);

Note: the php.ini parameter oci8.privileged_connect must be true for
PHP to allow OCI_SYSDBA or OCI_SYSOPER connections.


Actual result:
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Currently case 2 gives ORA-01031: insufficient privileges in test.php on line 3.