PHP and MySQL problem

I can easy connect to my remote database but I can`t select my data from it, I use the fallowing code
$result=mysql_query($sql);

$datarows=array();

while($data = mysql_fetch_array($result)) {

$datarows[]=$data;

}
and my array is empty I use it in Apach server and it works correct.
Please help me to solve this issue.