Piwik # Web Analytics

Piwik requires the php5-json extension which provides the functions json_encode() and json_decode()

It appears your PHP has not yet installed the php5-json extension. To use Piwik, please ask your web host to install php5-json or install it yourself, for example on debian system: sudo apt-get install php5-json.
Then restart your webserver and refresh this page.

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