Description:
------------
When present, the wouldblock argument should be a reference to a variable in which it will return whether it would block if attempted to lock the file in non-blocking mode.

However, since the argument is not forced to be a reference, it will only work if you pass an explicit reference to the argument, leading to the usual warnings.

Changing flock function entry in ext/standard/basic_functions.c like this fixes the problem:

PHP_FE(flock,third_arg_force_ref)


Reproduce code:
---------------
<?php
	if(!($file=(fopen("testfile","w")))) die("could not open file");
	if(flock($file,6,$wouldblock))
		echo "could lock ",serialize($wouldblock),"\n";
	else
		echo "failed lock\n";
	fclose($file);
?>


Expected result:
----------------
could lock i:0;

Actual result:
--------------
could lock N;