Error in whereRecordNumberInUrl(),

Hi and thanks in advance for your help

I have this code  but every page give me always the last item ... 

// load record from 'locali'
list($prodottiRecords, $prodottiMetaData) = getRecords(array(
'tableName' => 'prodotti',
'where' =>getNumberFromEndOfUrl(), 
'loadUploads' => true,
'leftJoin' => array( 
// foreign table => local field (that matches num in foreign table) 
'azienda' => 'azienda', 
),
));
$prodottiRecord = @$prodottiRecords[0]; // get first record