PHP implementation method of returning 13-digit timestamp

This article mainly introduces the implementation method of PHP returning 13-digit timestamp. Interested friends can refer to it. I hope it will be helpful to everyone.

The 13-digit timestamp generation function is as follows:

private function getMillisecond() { 
  list($t1, $t2) = explode(' ', microtime()); 
  return (float)sprintf('%.0f',(floatval($t1)+floatval($t2))*1000); 
}

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