$time = microtime(true) * 1000;
echo $time;
$dateTime = new DateTime();
$milliseconds = $dateTime->getTimestamp() * 1000 + round($dateTime->format('u') / 1000);
echo $milliseconds;
$milliseconds = gmdate('U') * 1000 + round(gmdate('u') / 1000);
echo $milliseconds;
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