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I'd recommend reading Fabien Potenciers (Symfony2 Framework) code, he writes very well designed software in PHP. Here's his blog http://fabien.potencier.org/

Off the top of my head he's the only one I'd definately recommend. Robert Lemke (Flow3 Framework), writes well structured enterprise code as well, Here's his blog: http://robertlemke.de/blog/posts

PHP: The Right Way [1] was well received here on HN [2] when it was announced a couple of months ago.

[1] http://www.phptherightway.com/

[2] http://news.ycombinator.com/item?id=4212568

Design without a language in mind, but to solve a problem. PHP is just how you tell the computer how to do something. But your solution is what ends up being elegant or messy.

PHP Best Practices (http://phpbestpractices.org/) might be useful. I can't personally vouch for it.

Yii framework, design patters, write unit test for your code

Ask HN: Writing better PHP