If you are running many benchmarks, it may be a good idea to add a description to them:

Chrono::describe('Query with joints');
Chrono::start();

// Run the query

print Chrono::meter();

Output:

Query with joints | 1.43 seconds (1424 ms)

Warning: if you prefer to use the shorthand benchmark method, make sure to call the describe method within your benchmark:

Chrono::benchmark(function () {
    Chrono::describe('Task');

    // Do your thing
});

You need to do this because all internal values are cleared out upon a new benchmark call.

The benchmark method allows a shorthand synthax that I hope will be much appreciated.

Based on feedback from a fellow PHP developer, changed the now() method to simpler microtime(true).