[PEPr] Comment on Images::Image_Diff

Is there any compelling reason to make these static methods?

Being static means I can't mock them out, and makes them more like
namespaced functions than an Image_Diffing object.

Ie:

Image_Diff::nearlySame()

could easily be

$diff = new Image_Diff();

$diff->nearlySame();

while having none of the drawbacks of statics
(http://misko.hevery.com/code-reviewers-guide/flaw-brittle-global-state-singletons/)

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http://pear.php.net/pepr/pepr-proposal-show.php?id=611

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