How to Async Measure Execution Time in PHP - Code Snippet

// Task: Async Measure Execution Time
// Language: PHP

function async_measure_execution_time() {
    // Implementation for Async Measure Execution Time
    $ result = ...; // Initialize variable
    // TODO: Implement core logic here
    // Step 1: Prepare data
    // Step 2: Process Async Measure Execution Time
    echo("Done");
}