Implement UUID v7 - time-ordered UUIDs

src/main/php/util/UUID.class.php

@@ -228,6 +228,33 @@ public static function randomUUID() {
     ]);
   }
 
+  /**
+   * Create a version 7 UUID based upon the UNIX epoch in milliseconds and
+   * pseudorandom bits
+   *
+   * @param  ?int $ms
+   * @return self
+   */
+  public static function timeOrderedUUID($ms= null) {
+    $t= (int)($ms ?? microtime(true) * 1000);
+
+    return new self([
+      7,
+      ($t >> 16) & 0xffffffff,
+      $t & 0xffff,
+      random_int(0, 0x0fff),
+      random_int(0, 0x3fff) | 0x8000,
+      [
+        random_int(0, 0xff),
+        random_int(0, 0xff),
+        random_int(0, 0xff),
+        random_int(0, 0xff),
+        random_int(0, 0xff),
+        random_int(0, 0xff),
+      ]
+    ]);
+  }
+
   /**
    * Returns version
    *

src/test/php/util/unittest/UUIDTest.class.php

@@ -147,6 +147,16 @@ public function twoRandomUUIDsNotEqual() {
     Assert::notEquals(UUID::randomUUID(), UUID::randomUUID());
   }
 
+  #[Test]
+  public function timeOrderedUUID() {
+    Assert::equals(7, UUID::timeOrderedUUID()->version());
+  }
+
+  #[Test]
+  public function timeOrderedUUIDPrefix() {
+    Assert::matches('/^019bf452-f817/', UUID::timeOrderedUUID(1769330636823)->hashCode());
+  }
+
   #[Test]
   public function md5UUID() {
     Assert::equals(3, UUID::md5UUID(UUID::$NS_DNS, 'example.com')->version());