Description:
------------
The documentation page for flock() should clearly state that $handle is symbolically linked.

Reproduce code:
---------------
<?php

$fo = fopen('lockfile.txt','a');

flock($fo,LOCK_EX);

$fo = '';

// Lock is disable

?>

(This is a copy of mallory dot dessaintes at gmail dot com's User Contributed Note on that page)

Expected result:
----------------
Given PHP's usual behavior related to variables, one would expect either that (1) flock() wasn't affected by any subsequent change of $handler, or (2) that this peculiarity would be explicitly documented.

Actual result:
--------------
Neither of the above. If (1) isn't an option, (2) should be implemented -- that is, the documentation should mention this explicitly.