Questions about the Oracle character set

About Oracle Character Set issues
MySQL has a very handy set NAMES UTF8
Does Oracle have a similar statement? Thank you

The problem I have now is that the database is Oracle (GBK), the PHP page is UTF8, and the encoding format cannot be changed.
Of course, using ICONV can solve the problem, but relatively, less efficient. Thank you

------Solution--------------------
You can set the output character set when you connect to the database.
Resource Oci_connect (String $username, String $password [, String $db [, String $charset [, int $session _mode]]

