The array_map() function returns an array containing the results of applying the callback to each value of the array used as arguments for the callback.

1. Syntax:

Syntax:

array_map(function_name, array1, array2, array3, ...)

Parameters:

    - function_name: A callable function to apply to each element in each array.
    - array1: It is an array of elements to which the callback function applies.
Note: We can send multiple arrays in the array_map() function.

2. Example:

Code:

<?php
  function square($n) {
    return ($n * $n);
  }
  
  $a = [1, 2, 3, 4, 5];
  $b = array_map('square', $a);
  print_r($b);
?>

Output:

Array ( [0] => 1 [1] => 4 [2] => 9 [3] => 16 [4] => 25 )