Earlier this week, the initial CTP of the “PHP SDK for Windows Azure” was released on Codeplex.

You can read more about this project on the Interoperability @ Microsoft blog.  From the blog post:

The PHP SDK for Windows Azure focuses on REST and provides the following core features:

  • PHP classes for Windows Azure blobs, tables & queues
  • Helper Classes for HTTP transport, AuthN/AuthZ, REST & error management
  • Manageability, instrumentation & logging support

The current CTP release supports accessing Windows Azure blob storage from PHP.