Generate UUID v7

Generate a Unix timestamp-based UUID v7 with millisecond precision, ideal for database primary keys.

Code

Utilities

$timestamp = (int)(microtime(true) * 1000);
$randA = mt_rand(0, 0xfff);
$randB1 = mt_rand(0, 0x3fff) | 0x8000;
$randB2 = mt_rand(0, 0xffffff) << 24 | mt_rand(0, 0xffffff);
return sprintf('%08x-%04x-7%03x-%04x-%012x', $timestamp >> 16, $timestamp & 0xffff, $randA, $randB1, $randB2);

Server

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Generate UUID v5

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Generate UUID v6

Generate a reordered time-based UUID v6 with improved sortability for databases.

Array Difference

Find elements in the first array that are not present in the second array.