[PEPr] Comment on PHP::PGraph

This looks interesting. And it's an impressive piece of work!

A few comments (just browsed through the code briefly):

 * add some examples
 * find a common "namespace" and stack all classes into it — since you
mention PHP 5.3, why not go all the way with proper namespaces and move
this code into pear2? (http://pear2.php.net)
 * avoid global constants with define() — e.g. use class constants if
possible
 * I read somewhere that PEAR is only required when you install through it,
but there is a `require_once "PEAR.php";` in PGraph.php. if you get rid off
this, that would be great.
 * maybe add a `composer.json` for flexibility
 * check if `private` is really necessary or if you could do with
`protected` to make extending your code easier
 * you can simplify many of these:
https://github.com/Willux/PGraph/blob/master/src/PGraph.php#L630-L634
 * strip require_once calls and rely on autoload — either provide one or
let the user decide what they want to do.

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http://pear.php.net/pepr/pepr-proposal-show.php?id=690