Error Log Warnings

Is there a way to prevent all the system error log messages
generated when viewing my bitweaver site? My error log fills
up with messages like:
PHP Warning: Module 'SQLite' already loaded in Unknown on line 0
PHP Warning: Module 'pspell' already loaded in Unknown on line 0
PHP Warning: Module 'pgsql' already loaded in Unknown on line 0
PHP Warning: Module 'mysqli' already loaded in Unknown on line 0
and so on...