flock() - how does this baby work?

Looking to lock a file. I acquire the lock twice here, and both times it's
exclusive. Am I missing something here? Does the second flock have to be on
a different file handle? Creating $fp2 pointing to the same file and then
trying to acquire an exclusive lock seemed to block, even with operation set
to 6.

<?
$fp = fopen("test", "w+");
if(flock($fp, 2))
 echo "locked";
if(flock($fp, 2))
 echo "locked";
?>

Output is two locked statements instead of the one I expected.

August