I've started working on a class using DOMDocument to assemble MathML in
php. The class, assuming I actually succeed, will eventually be used for
parsing LaTeX math equations to MathML without the need to have TeX
installed. I probably won't be able to support all the possibilities for
equations that LaTeX does w/o a TeX install (and definitely not user
defined macros) but I suspect I can (hopefully) cover most of the common
stuff.
One thing I don't know how to do, though, is write a function where
arguments are optional object.
IE for a function to generate an integral, the limits are optional but
if specified must be an object (since they may be an equation
themselves). I want the default to be some kind of a null object so I
know to do nothing with it if it is null.
With string/integer you just do
function foo($a='',$b='',$c=false) {
}
How do I specify a default null object, or otherwise make the argument
argument optional?
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