The BlueShoes PHP Syntax Exam is kind of fun. I did pretty well, but got some of the questions wrong involving array_merge() and unset() with references.
The two functions in PHP 5's SimpleXML extension that let you write out an XML document, simplexml_save_document_file() and simplexml_save_document_string() were removed in rev 1.39 of simplexml.c. Why? Are they coming back?