Piwik is not compatible with the directive zend.ze1_compatibility_mode = On

It seems your php.ini file has

zend.ze1_compatibility_mode = On

It makes PHP5 behave like PHP4. If you want to use Piwik you need to set

zend.ze1_compatibility_mode = Off

in your php.ini configuration file. You may have to ask your system administrator.

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