dolphin/single-functions/high-precision-unix-timestamp.php

<?php
/**
 *  dolphin. Collection of useful PHP skeletons.
 *  Copyright (C) 2019  Johannes 'Banana' Keßler
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the COMMON DEVELOPMENT AND DISTRIBUTION LICENSE
 *
 * You should have received a copy of the
 * COMMON DEVELOPMENT AND DISTRIBUTION LICENSE (CDDL) Version 1.0
 * along with this program.  If not, see http://www.sun.com/cddl/cddl.html
 */

/**
 * creates a high-precision UNIX timestamp
 * https://docs.microsoft.com/en-us/dotnet/api/system.datetime.ticks
 *
 * @return int
 */
static function timeticks() {
	$mtime = microtime();
	$parts = explode(' ', $mtime);
	
	# Using a string here to prevent overflow
	# PHP converts it to a double
	return sprintf('%d%03d', $parts[1], $parts[0] * 1000);
}