Overview
Change Ownership
[mitesh@Matrix ~]$ chown -R www-data:www-data /var/wwwNOTE!: The www-data user is used by nginx and php5-fpm. If you are running php as a different user then change ownership as per that.
Reset Directory/File Permissions
# Correct Directory Permissions
[mitesh@Matrix ~]$ find /var/www -type d -exec chmod 0755 {} \;
# Correct Files Permissions
[mitesh@Matrix ~]$ find /var/www -type f -exec chmod 0644 {} \;