Can i change Nginx variable client_max_body_size value from php.ini file?

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http://stackoverflow.com – i dont have a write access to /etc/nginx/nginx.conf file and i can see that client_max_body_size is set to a lower value than i need. Before i can contact the server administrator and get that bumped up, is it possible to override that using php.ini? the setup is Drupal using Nginx on a CentOS machine. (HowTos)