Phaser.Utils.String.UUID will return an RFC4122 complaint UUID as a string. This is used internally to avoid cache key conflicts, but is exposed for your own use as well.

CHANGELOG.md

@@ -55,6 +55,7 @@ The process of managing scissors in the WebGLRenderer has been completely rewrit
 * If you set `window.FORCE_WEBGL` or `window.FORCE_CANVAS` in the window in which the Phaser game is loaded it will over-ride the renderer type setting in your game config, and force either WebGL or Canvas. This is handy for quickly testing the differences between renderers without having to do a new build each time.
 * `TextureSource.source` is a new property that contains the original source of the Texture image. It is cleared when the source is destroyed.
 * `TransformMatrix.copyToContext` is a new method that will copy the values from the Matrix to the given Canvas Rendering Context.
+* `Phaser.Utils.String.UUID` will return an RFC4122 complaint UUID as a string. This is used internally to avoid cache key conflicts, but is exposed for your own use as well.
 
 ### Updates
 

src/utils/string/UUID.js

@@ -0,0 +1,27 @@
+/**
+ * @author       Richard Davey <rich@photonstorm.com>
+ * @copyright    2018 Photon Storm Ltd.
+ * @license      {@link https://github.com/photonstorm/phaser/blob/master/license.txt|MIT License}
+ */
+
+/**
+ * Creates and returns an RFC4122 version 4 compliant UUID.
+ * 
+ * The string is in the form: `xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx` where each `x` is replaced with a random
+ * hexadecimal digit from 0 to f, and `y` is replaced with a random hexadecimal digit from 8 to b.
+ *
+ * @function Phaser.Utils.String.UUID
+ * @since 3.12.0
+ *
+ * @return {string} The UUID string.
+ */
+var UUID = function ()
+{
+    return 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, function (c)
+    {
+        var r = Math.random() * 16 | 0, v = c == 'x' ? r : (r & 0x3 | 0x8);
+        return v.toString(16);
+    });
+};
+
+module.exports = UUID;

src/utils/string/index.js

@@ -13,6 +13,7 @@ module.exports = {
     Format: require('./Format'),
     Pad: require('./Pad'),
     Reverse: require('./Reverse'),
-    UppercaseFirst: require('./UppercaseFirst')
+    UppercaseFirst: require('./UppercaseFirst'),
+    UUID: require('./UUID')
 
 };