Extremely simple php benchmark

bench.php

<?php

$benchMark = new class() {
	const MEASUREMENT_BLOCKS = 20;
	const ITERATIONS         = 100000;

	private function variant1(): void
	{
		// Implement variant 1 here
	}

	private function variant2(): void
	{
		// Implement variant 2 here
	}

	private function executeVariant(callable $variant): float
	{
		$total = 0;
		for ($runs = 0; $runs < self::MEASUREMENT_BLOCKS; $runs++) {
			$startTime = microtime(true);
			for ($i = 0; $i < self::ITERATIONS; $i++) {
				call_user_func_array($variant, []);
			}
			$endTime = microtime(true);
			$total   += abs($startTime - $endTime);
		}

		return $total / self::MEASUREMENT_BLOCKS;
	}

	public function run(): void
	{
		echo 'Begin BenchMark...', PHP_EOL;

		$variant1 = 0.0;
		$variant2 = 0.0;
		$start    = microtime(true);

		// First block (1, 2)
		echo '  First Execution', PHP_EOL;
		echo '    Variant 1', PHP_EOL;
		$variant1 += $this->executeVariant([$this, 'variant1']);
		echo '    Variant 2', PHP_EOL;
		$variant2 += $this->executeVariant([$this, 'variant2']);
		echo PHP_EOL;

		// Second block (2, 1)
		echo '  Second Execution', PHP_EOL;
		echo '    Variant 2', PHP_EOL;
		$variant2 += $this->executeVariant([$this, 'variant2']);
		echo '    Variant 1', PHP_EOL;
		$variant1 += $this->executeVariant([$this, 'variant1']);
		echo PHP_EOL;

		$totalDuration = microtime(true) - $start;
		echo 'Variant 1: ', sprintf('%.4f Seconds', $variant1 / 2), PHP_EOL;
		echo 'Variant 2: ', sprintf('%.4f Seconds', $variant2 / 2), PHP_EOL;
		echo PHP_EOL;

		echo 'Total runs: ', (self::MEASUREMENT_BLOCKS * self::ITERATIONS * 2) * 2;
		echo ' (', (self::MEASUREMENT_BLOCKS * self::ITERATIONS * 2), ' per variant)', PHP_EOL;
		echo 'Total duration: ', sprintf('%.4f Seconds', $totalDuration), PHP_EOL;
	}
};

$benchMark->run();