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Tenho a função abaixo para contar o numero de entradas. Se o valor for diferente de zero tudo bem mas se for empty quero passar um zero...

function yesterdayUserStats ($var1,$var2,$var3) {
    $query = "SELECT COUNT(task_statusID) 
          FROM go_tasks 
          WHERE task_statusID = $var1 AND $var2 = $var3 AND DATE(task_datebegin) = DATE_SUB(CURDATE(), INTERVAL 1 DAY)
          GROUP BY task_statusID"; 
    $result = mysql_query($query) or die(mysql_error());
    // Print out result
    while($row = mysql_fetch_array($result)){
        return $row['COUNT(task_statusID)'];
    } 
}

Alguém descobre porque não funciona?

Obrigado

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