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Symfony 5: The Fast Track is the best book to learn modern Symfony development, from zero to production. +300 pages in full color showing how to combine Symfony with Docker, APIs, queues & async tasks, Webpack, Single-Page Applications, etc.

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WARNING: You are browsing the documentation for Symfony 4.3 which is not maintained anymore. Consider upgrading your projects to Symfony 5.1.

The Symfony Polyfill / UUID Component

4.3 version

The Symfony Polyfill / UUID Component

This component provides uuid_* functions to users who run PHP versions without the UUID extension.


$ composer require symfony/polyfill-uuid


If you install this component outside of a Symfony application, you must require the vendor/autoload.php file in your code to enable the class autoloading mechanism provided by Composer. Read this article for more details.


Once this component is installed in your application, you can use the following functions, no matter if the PHP UUID extension is installed or not in your server.

Provided Constants

  • UUID_VARIANT_NCS (value = 0)
  • UUID_VARIANT_DCE (value = 1)
  • UUID_VARIANT_OTHER (value = 3)
  • UUID_TYPE_DEFAULT (value = 0)
  • UUID_TYPE_TIME (value = 1)
  • UUID_TYPE_DCE (value = 4)
  • UUID_TYPE_NAME (value = 1)
  • UUID_TYPE_RANDOM (value = 4)
  • UUID_TYPE_NULL (value = -1)
  • UUID_TYPE_INVALID (value = -42)

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