Description:
------------
is_file and filesize not working on a NFS mount.
These files are readable and writable for user (Using PHP CLI).

is_file and filesize working for local files. Not for NFS mounts.

By the way, file_exist is working.

The code is working under PHP 5.2.3 (cli). And not under PHP 5.2.9 (cli)

Reproduce code:
---------------
echo "Full path : $SourceFile\n";
	
if (!chmod($SourceFile, 0777)) {
   echo "Unable to Chmod file\n";
}
		
clearstatcache();
	
if (!file_exists($SourceFile)) {
    echo "Source file not found\n";
}

$FileSize = filesize($SourceFile);

if (!$FileSize) {
    echo "Source file empty !\n";
}



Expected result:
----------------
Full path : /home/files/3/4/0/340db92364af5c0616187f6e1db86ed7

.. and continue the script

Actual result:
--------------
Full path : /home/files/3/4/0/340db92364af5c0616187f6e1db86ed7
Source file empty !

# ls -lah /home/files/3/4/0/340db92364af5c0616187f6e1db86ed7
-rwxrwxrwx 1 nobody nobody 9.5M Apr 26 12:00 /home/files/3/4/0/340db92364af5c0616187f6e1db86ed7