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An array is a systematic arrangement of objects, usually in rows and columns. Generally, a collection of data items that can be selected by indices.
An array in PHP is actually an ordered map. A map is a type that associates values to keys. This type is optimized for several different uses; it can be treated as an array, list (vector), hash table (an implementation of a map), dictionary, collection, stack, queue, and probably more. As array values can be other arrays, trees and multidimensional arrays are also possible.
It includes the following -