codeguy/php-the-right-way — pull request #317 by enkrates (2013-10-19 00:02:12+00:00)
Title: Style update for Programming Paradigms and Functional Programming

These two sections share some text and this commit brings them back into
sync. Also, a link to the Wikipedia Higher-Order Functions article was
added and some small stylistic changes were made to improve grammar and
readability.