Description:
------------
copy, chmod , fopen will not work !

Reproduce code:
---------------
<?php
$filename='/filet/possu.txt';
if (is_writable($filename)  &&  is_readable($filename) && is_executable($filename) ) {
   echo 'kirjoitus,luku ja suoritus';
$fp=fopen("$filename","w");
fwrite($fp,"paskajuttu");
fclose($fp);
}
 else {
   echo 'ei voi kirjoittaa';
}
?>

Expected result:
----------------
kirjoitus,luku ja suoritus
Warning: fopen(/filet/possu.txt) [function.fopen]: failed to open stream: Permission denied in /var/www/html/aja.php on line 5

Warning: fwrite(): supplied argument is not a valid stream resource in /var/www/html/aja.php on line 6

Warning: fclose(): supplied argument is not a valid stream resource in /var/www/html/aja.php on line 7