PHP array_map Function Explained with Examples

The purpose of the array_map function is to apply a callback function to each element in an array, returning a new array where the elements are the results of the callback function.

For example, if there is an array $numbers = [1, 2, 3, 4, 5] and a callback function $callback = function($n) { return $n * 2; }, using the array_map function applies $callback to each element of the $numbers array, resulting in a new array $newNumbers = [2, 4, 6, 8, 10].

The syntax of the array_map function is:
array_map(callable $callback, array $array1, array …$arrays): array

In this case, $callback is a callback function, $array1 is the array being processed, and $arrays are optional parameters that can be used to pass in multiple arrays for processing. The return value is a new array.