meowboard/include/uuid.php

<?php
/* VanillaUUID v1.0.1 by abbieoverflight.
 * Licenced under the EUPLv1.2.
 * https://git.colean.cc/threeoh6000/vanillauuid */
function randomLongHex() {
	$byt = random_bytes(64);
	return bin2hex($byt);
}

function genUuid4() {
	$template = randomLongHex();

	$ri = random_int(0b1000, 0b1011);
	$encoded_byt = dechex((int)$ri);
	$buildup = substr($template, 0, 8) . "-" . substr($template, 8, 4) . "-4" . substr($template, 13, 3) . "-" . $encoded_byt . substr($template, 17, 3) . "-" . substr($template, 20, 12);

	return $buildup;
}

function nilUuid() {
	return "00000000-0000-0000-0000-000000000000";
}

function omniUuid() {
	return "FFFFFFFF-FFFF-FFFF-FFFF-FFFFFFFFFFFF";
}
?>