How to Async Append to File in PHP - Code Snippet

How to perform 'Async Append to File' in PHP.

example.php
// Task: Async Append to File
// Language: PHP

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