title: Setting environment variables for accessing in PHP when using Apache
body: <p>I have a Linux environment and I have a PHP Web Application that conditionally runs based on environment variables using <code>getenv</code> in PHP. I need to know how these environment variables need to be set for the application to work correctly. I am not sure how to set this up on Apache.</p>
  
  <p>Also, I need to be able to configure separate environment variables for each domain separately.</p>
  
  <p>Please advice on how can I achieve this.</p>