Example usage filter `wpcfm_current_env`

wpcfm_current_env.php

<?php
// wp-content/mu-plugins/wp-cfm-multi-env.php
// ...

function my_wpcfm_current_env_set( $env ) {
    // Detect with your own code logic the current environment the WordPress site is running.
    // Generally this will be defined in a constant inside `$_ENV` or `$_SERVER` super-globals.
    // ...
    $env = 'dev';
    return $env;
}
add_filter( 'wpcfm_current_env', 'my_wpcfm_current_env_set' );