Add UUID creation feature

git-svn-id: https://svn.fournier38.fr/svn/ProgSVN/trunk@3589 bf3deb0d-5f1a-0410-827f-c0cc1f45334c

uuid.php

@@ -0,0 +1,35 @@
+<?php
+/** DomFramework
+    @package domframework
+    @author Dominique Fournier <dominique@fournier38.fr> */
+
+/** Generate a UUID v4
+  */
+class uuid
+{
+  /** Based on http://php.net/manual/fr/function.uniqid.php#94959
+    */
+  public static function uuid()
+  {
+    return sprintf('%04x%04x-%04x-%04x-%04x-%04x%04x%04x',
+
+      // 32 bits for "time_low"
+      mt_rand(0, 0xffff), mt_rand(0, 0xffff),
+
+      // 16 bits for "time_mid"
+      mt_rand(0, 0xffff),
+
+      // 16 bits for "time_hi_and_version",
+      // four most significant bits holds version number 4
+      mt_rand(0, 0x0fff) | 0x4000,
+
+      // 16 bits, 8 bits for "clk_seq_hi_res",
+      // 8 bits for "clk_seq_low",
+      // two most significant bits holds zero and one for variant DCE1.1
+      mt_rand(0, 0x3fff) | 0x8000,
+
+      // 48 bits for "node"
+      mt_rand(0, 0xffff), mt_rand(0, 0xffff), mt_rand(0, 0xffff)
+    );
+  }
+}