方法一：

Apache/Php umask determines the permissions for the newly created files. On a VPS / Dedicated server you can change the umask to suit your specific needs by editing:
/usr/local/apache/bin/envvars
There you should add:
umask 022
Right after that restart Apache and Apache/Php's default umask will become 22.

方法二：

For CentOS and other Red Hat distros, add the umask setting to /etc/sysconfig/httpd and restart apache.

[root ~]$ echo "umask 002" >> /etc/sysconfig/httpd

[root ~]$ service httpd restart