putenv() is a PHP function that is used for setting the value of a particular environment variable

Advanced PHP Error Handling via htaccess | Perishable Press Content-Security-Policy PHP Examples Configuring PHP Applications using Environment Variables Configuring PHP Applications using Environment Variables apache-env-vars.conf Setting environment variables for PHP-FPM getenv() is a PHP function used for returning the specific environment variable's value putenv() is a PHP function that is used for setting the value of a particular environment variable Nested ENV vars ENV var validation Reserved environment variable names Using secure App secrets App secrets are ordered in a tree structure: MySQL configuration with App secrets Working with JSON - Learn web development | MDN status Response - An Ajax Call