PHP How this exception should be resolved

How should PHP solve this error?
[10-mar-2012 14:44:01] PHP warning:module ' timezonedb ' already loaded in Unknown on line 0

Hard for a long time don't know how to solve
Know the trouble to tell a cry ~ Thank you!

------Solution--------------------
Check that the php.ini is not repeatedly loaded timezonedb.so

Extension Add semicolon comment off timezonedb.so restart Apache
------Solution--------------------
It is estimated that the php_timezonedb.dll is corrupt, or does not match the PHP version, or a thread-safe version that cannot be placed on a thread-unsafe PHP

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