Abstract classes, abstract methods, interfaces, what?

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Published: October 3, 2013
Link: http://programmingarehard.com/2013/10/03/abstract-interfaced-what.html
Excerpt: “If you’ve been developing with PHP for any length of time you’ve probably heard of concrete classes, abstract classes, abstract methods, and interfaces. Many of the popular frameworkd encourage you to “program to an interface”, but what does that mean?”

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