How to set Environment variable in linux for apache and php

To set an environment variable in Linux for PHP and apache do the following-

1) Sudo vim /etc/sysconfig/httpd 
Add-> TEST_ENV=PROD

2) vim /etc/httpd/conf/httpd.conf
Add-> SetEnv TOBY_ENV ${TOBY_ENV}

3) echo getenv('TOBY_ENV');

                                                               DONE!!!