Arrays are one of the most versatile data types in PHP. Their importance is reflected by the fact that there are more than 80 core functions dedicated to handling data stored in arrays. They can be generally categorized as for modifying, sorting, comparing, and extracting information from arrays. This chapter doesn’t attempt to cover all of them. It focuses on some of the more interesting and useful applications of manipulating arrays.
Understanding various approaches to modifying the contents of an array
Converting an array to a grammatical string
Finding all permutations of ...