How to Async Grayscale Image in PHP - Code Snippet

// Task: Async Grayscale Image
// Language: PHP

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