Description:
------------
Sometimes, I need to show a big error message on a trigger of Oracle. Oracle supports this type of situation, but $php_errormsg does not display more than 500 characters.

Reproduce code:
---------------
create procedure sp_test as
begin
  raise_application_error(-20000, 'more than 500 characters');
end;


$stmt = ociparse($conn, 'begin sp_test; end;');
ociexecute($stmt, OCI_DEFAULT);
echo $php_errormsg;


Expected result:
----------------
The full message.

Actual result:
--------------
The message truncated to 500 characters.