Use the Zend_Service_Piwik-component to query your Piwik-Installation via the API.
$piwik = new Zend_Service_Piwik();
$piwik->setHost('http://demo.piwik.org')
->setAuthToken('anonymous')
->setIdSite(7)
->setFormat(Zend_Service_Piwik::FORMAT_JSON)
->setDate('previous7');
$pageTitles = $piwik->Actions()->getPageTitles();
echo $pageTitles;$pageTitles contains the relevant information and can be processed further if needed.
Alternativly you can pass an Zend_Config-object to set the options.
[piwik]
host = 'http://demo.piwik.org'
tokenauth = 'anonymous'
idsite = 7
format = 'json'
date = 'previous7'$configFile = '/path/to/ini';
$config = new Zend_Config_Ini($configFile, 'piwik');
$piwik = new Zend_Service_Piwik($config);