note 102313 added to function.oci-parse

When you want to call stored function (and want to read its result) which executes DML queries (insert, update, delete) inside its body you can't use "select your_stored_function(:param1, :param2) from dual" because you will receive "ORA-14551: cannot perform a DML operation inside a query" error.

In order to call such function and get its result you need to wrap it into nested procedure with OUT parameter like this:

DECLARE
  PROCEDURE caller(return_value OUT NUMBER) AS
  BEGIN
    return_value := your_stored_function(:param1, :param2);
  END;
BEGIN
  caller(:return_value);
END;

and bind to :return_value variable to get the result of function.
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Manual Page -- http://www.php.net/manual/en/function.oci-parse.php
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