"You can tear a poem apart to see what makes it tick... You're back with the mystery of having been moved by words. The best craftsmanship always leaves holes and gaps... so that something that is not in the poem can creep, crawl, flash or thunder in."
Next to object oriented programming, normalization of relational data structures and refactoring, recursion is one of the topics in computer science most often overlooked by the self-taught PHP programmer. This article is an attempt to help redress this situation.