apache - PHP don't create the folder mkdir() -

i trying create new folder using php localhost/phpproject3/create.php:

<?php mkdir('newdir', 0777); ?> 

but code doesn't it. doesn't work :

<?php mkdir('/var/www/phpproject3/newdir',0777); ?>  

i installed lamp. think problem in settings (maybe chmod ?) because php script works. example create simple test.php:

<?php echo 'great'; ?> 

and run it: localhost/phpproject3/test.php result great.

i use netbeans. here files: /var/www/phpproject3 . run it: localhost/phpproject3/... content of /etc/apache2/sites-available/default:

<virtualhost *:80>     serveradmin webmaster@localhost     documentroot /var/www     <directory />         options followsymlinks         allowoverride none     </directory>     <directory /var/www/>         options indexes followsymlinks multiviews         allowoverride none         order allow,deny         allow     </directory>      scriptalias /cgi-bin/ /usr/lib/cgi-bin/     <directory "/usr/lib/cgi-bin">         allowoverride none         options +execcgi -multiviews +symlinksifownermatch         order allow,deny         allow     </directory>      errorlog ${apache_log_dir}/error.log      # possible values include: debug, info, notice, warn, error, crit,     # alert, emerg.     loglevel warn      customlog ${apache_log_dir}/access.log combined      alias /doc/ "/usr/share/doc/"     <directory "/usr/share/doc/">         options indexes multiviews followsymlinks         allowoverride none         order deny,allow         deny         allow 127.0.0.0/255.0.0.0 ::1/128     </directory>  </virtualhost> 

i can't create file using touch().

can me ?

which user webserver run as? can see if write

ps aux 

and take look. user www-data (if use ubuntu).

then chown dir user , give user write permissions directory.

chown www-data /var/www/phpproject3

and

chmod u+w /var/www/phpproject3

an alternative instead use group permissions.

chgrp www-data /var/www/phpproject3

and

chmod g+w /var/www/phpproject3

assuming webserver runs group www-data.