My PHP code on my PC(working great) doesn't work on my laptop

I have these two functions to fill a dropdown list.

function fillcombo($table,$colname)
{

$list="";

$sql="select $colname from $table order by $colname";

$Rs = setRs($sql); // Get data from database using setRs function


    foreach($Rs as $opt) {

    $list .='<option value="'.$opt[$colname] .'">'. $opt[$colname] .'</option>';

    }
    unset($opt);
 return $list;
}

//---------------------------------------------------------------------------

function setRs($sql){

include ('connect.php');

mysqli_select_db($conn,"MyDB" ); //Select database

$Rs = mysqli_query($conn,$sql) or die(mysqli_error($conn)); //Run Query

return $Rs; //Return recordset

$conn->close();

}


// This $Recordset has 93 rows as in my database. But the foreach loops only 5 times.

return $list yields the following html.

<option value=""></option><option value=""></option><option value=""></option><option value=""></option><option value=""></option>

On my PC it works fine and the select list is filled with all the 93 values. Any help will be greatly appreciated..Thanks