This Cheat sheet is designed to be something you can use to study for the HAM Radio Technician's exam. It is based on the technique at http://arfunk.com/fun/amateur-ham-radio/guide-to-passing-amateur.html which instructs you to make a cheat sheet, and transcribe it to another piece of paper just before taking your exam so the material is fresh in your head. DO NOT TRY TO TAKE THIS INTO THE EXAM!
A quick reference guide for PHP, with functions references, a regular expression syntax guide and a reference for PHP's date formating functions. As of 28/6/14, the cheat sheet now includes popup links to the appropriate PHP manual pages.