Portability: Backwards Compatibility

• Portability used to be handled by the optimize option.
• optimize is now deprecated.
• Old scripts work under the new system.
• If optimize gets set to portability the following drivers go into these modes:
  • oci8: DB_PORTABILITY_LOWERCASE and DB_PORTABILITY_DELETE_COUNT
  • fbsql, mysql, mysqli, sqlite: DB_PORTABILITY_NUMROWS
• If optimize gets set to performance new portability system is switched off.