Upload multiple files

I want to do this for multiple files. I tried to do this with a foreach -loop but I think I made some mistakes with the array "userfile". In this example userfile is just the "name" in the input tag. When uploading multiple files userfile is -ofcourse- an array like this: name='userfile[]'. Now I want to know how to handle with that array in somekind of a loop. For one file the script is this: if (is_uploaded_file($_FILES['userfile']['tmp_name'])) {

       $namename=$_FILES['userfile']['name'];
    move_uploaded_file($_FILES['userfile']['tmp_name'],"/path/$namename");
    if (rename("/path/$namename", "/path/$uartist-$usong.mp3"))
        {
         $query = "INSERT INTO table (column1,column2,column3) values ('$value1','$value2','$value3')";
         mysql_query($query) or die ("Couldn't make query!");
         print "File Upload and rename succesful!";
        } else { print "File Upload failed!"; }

} antti