TechEmpower.FrameworkBenchmarks/frameworks/PHP/leaf/index.php

<?php

require __DIR__.'/vendor/autoload.php';

app()->get("/plaintext", function () {
    response()->plain('Hello, World!');
});

app()->get('/json', function () {
    response()->json(['message' => 'Hello, World!']);
});

app()->run(); // commented with workerman

// Workerman
function run(): string
{
    ob_start();

    app()->run();
    header(HeaderDate::$date); // To pass the bench, nginx auto add it

    return ob_get_clean();
}