Nexen.net has declared April the Month of PHP Functions. They are posting an article a day to help introduce developers to a new PHP functions each day. Here’s their description of the project.

the month of PHP function aims at introducing PHP developers to a new PHP function every day : one that gets too little usage and spotlight, though is highly useful. There are over 3000 functions in PHP, and they all solve different problems. Sometimes, by sheer ignorance, PHP developers reinvent the wheel, and duplicate an existing function.

Pop over and give them a look.