Sorry if this is an old question:
Yep, but I'll answer anyway :P
Where can I find information on any plans to create a compiler for PHP, especially v5.x?
There *are* some compilers out there, not sure where all of them are with respect to version of PHP. turck, zend, roadsend, maybe others?
Barring that, is there a PHP syntax checker that would enforce some of the
types of things that a compiler would find?
I remember from back in my MS-DOS days the very good Clipper compiler for the dBase III language. dBase III, not unlike PHP, was an interpretive language, and along the way some bright folks figured out how to write a true dBase language compiler, which then allowed for all sorts of nice things to happen. One of the nicest things for me was that the compiler caught all sorts of "little" things before the same code in the interpreter would find them at run-time.
You wouldn't necessarily need a compiler to do this. There are PHP editors out there that will check syntax. PHPEdit, Zend, definitely others.
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