PHP simple debug helper

DebugHelper.php

class DebugHelper
{
    /**
     * @var int
     */
    static $lastTime = 0;

    /**
     * @var int
     */
    static $lastMemory = 0;

    /**
     * @param string $message
     * @param bool $printTime
     * @param bool $printMemory
     */
    public static function printInfo(string $message, bool $printTime = true, bool $printMemory = true)
    {
        $currentTime = microtime(true);
        $currentMemory = memory_get_usage();
        $peakMemory = self::formatMemory(memory_get_peak_usage());
        $executedTime = $currentTime - self::$lastTime;
        $diffMemory = $currentMemory - self::$lastMemory;
        $diffMemory = self::formatMemory($diffMemory);
        $totalMemory = self::formatMemory($currentMemory);
        if (empty(self::$lastTime)) {
            $executedTime = date('Y-m-d H:i:s', $executedTime);
        }
        echo "{$message} executed time: {$executedTime}, total memory: {$totalMemory}, diff memory: {$diffMemory}, peak memory: {$peakMemory}\n";
        self::$lastTime = $currentTime;
        self::$lastMemory = $currentMemory;
    }

    /**
     * @param int $memory
     *
     * @return string
     */
    private static function formatMemory(int $memory): string
    {
        $units = ['bytes', 'KB', 'MB'];
        $count = 0;
        for (; abs($memory) > 1024 && $count < 2; $memory /= 1024, ++$count);

        return sprintf('%.02f %s', $memory, $units[$count]);
    }
}