On the php|architect site today Beth mentions a contest that's being put on by the WestHost hosting group is putting on to find the best function - custom bits of functionality that are the most impressive and do their job the best.
Submit your entry by March 15th to win one of the above prizes. Winner's will be selected from a panel of judges reviewing the top rated PHP functions / code based on utility, creativity, efficiency, and readability. Make sure to get the word out about your submission in order to get votes to have a chance to win.
The submission form lets you fill in your contact details and copy & paste in the function. You can use any version of PHP you'd like and even the framework of your choice (just be sure it include instructions on its use).