note 56429 added to function.chmod

I am using chmod to give permission to httpd.conf file under the root login but php says that you are not permitted to do the function can somebody help me out. Regards ---- Manual Page -- http://www.php.net/manual/en/function.chmod.php Edit -- http://master.php.net/manage/user-notes.php?action=edit+56429 Delete: added to the manual -- http://master.php.net/manage/user-notes.php?action=delete+56429&report=yes&reason=added+to+the+manual Delete: bad code -- http://master.php.net/manage/user-notes.php?action=delete+56429&report=yes&reason=bad+code Delete: spam -- http://master.php.net/manage/user-notes.php?action=delete+56429&report=yes&reason=spam Delete: useless -- http://master.php.net/manage/user-notes.php?action=delete+56429&report=yes&reason=useless Delete: non-english -- http://master.php.net/manage/user-notes.php?action=delete+56429&report=yes&reason=non-english Delete: other reasons -- http://master.php.net/manage/user-notes.php?action=delete+56429&report=yes Reject -- http://master.php.net/manage/user-notes.php?action=reject+56429&report=yes Search -- http://master.php.net/manage/user-notes.php