deleting multiple files

[sridharao]

While deleting multiple files, I often come across with statements where single statement is executed for every record. It is like displaying a check box to the user and then deleting using the following code:

if($delete){
for($i=0;$i<$count;$i++){
$del_id = $checkbox[$i];
$sql = "DELETE FROM $tbl_name WHERE id='$del_id'";
$result = mysql_query($sql);
} 

I have a list of ID's in a string which I must delete at once. Is this query legal in mysql?

$string = "12, 34, 45, 36, 14, 67, 89";
$query = "DELETE FROM mytable  WHERE mytable.ID IN ($string)"
mysql_query($query) or die(mysql_error());