chmod()


I am trying to chmod a file. my test code is...

if(file_exists($nwfn)) {
echo "Found ($nwfn)<br>\n";
if (chmod($nwfn, 0777)){
echo "chmod changed to 0777<br>\n";
}
}
--------------------------------------
$nwfn is the filesystem location of the file..

output of this code is...

Found (/home/mysite/public_html/test/admin/includes/configure.php)

Warning: chmod(): Operation not permitted in
/home/mysite/public_html/test/admin/php-bin/create_test.php on line 13

my question is.. for what reason is the chmod operation not permitted?

also when you have a file in a subdirectory and the chmod of the file is 777
does it matter what the chmod of the directories are to be able to edit the
file?

Thnx
Alex
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