Abhinav Singh has a new post to his blog that looks at using a powerful tool, memcached, with PHP to create a simple queue system that could be reused just about anywhere.
Memcached is a scalable caching solution developed by Danga interactive. One can do a lot of cool things using memcached including spam control, online-offline detection of users, building scalable web services. In this post, I will demonstrate and explain how to implement fast scalable queues in PHP.
He starts with an overview of what the queue will let you do - save data into the queue with a unique identifier and pull it back out based on the key requested (and is removed from the queue). The code sets up the connection to the memcached server and gives you methods to check if the queue is empty and to push and pull records in and out. A bit of sample code illustrates how to put it to use.