How to Async Get Unique Values in PHP - Code Snippet

How to perform 'Async Get Unique Values' in PHP.

example.php
// Task: Async Get Unique Values
// Language: PHP

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