How to Async Get Environment Variable in PHP - Code Snippet

// Task: Async Get Environment Variable
// Language: PHP

function async_get_environment_variable() {
    // Implementation for Async Get Environment Variable
    $ result = ...; // Initialize variable
    // TODO: Implement core logic here
    // Step 1: Prepare data
    // Step 2: Process Async Get Environment Variable
    echo("Done");
}