PHP - Function array_map()

Syntax

array array_map ( callback $callback, array $array1 [, array $array2...] );

Definition and Usage

It returns an array containing all the elements of array1 after applying the callback function to each one.

Parameters

Return Values

It returns an array containing all the processed elements of array1.

Example

Try out following example −

<?php
   function cube($n) {
      return($n * $n * $n);
   }
   
   $input = array(1, 2, 3, 4, 5);
   $result = array_map("cube", $input);
   
   print_r($result);
?> 

This will produce the following result −

Array ( [0] => 1 [1] => 8 [2] => 27 [3] => 64 [4] => 125 )

Using multiple arrays.

<?php
   function call_back_func($v1, $v2) {
      if ($v1 === $v2) {
         return "equal";
      }
      return "different";
   }
   
   $array1 = array(1, 2, 3, 4);
   $array2 = array(10, 2, 30, 4);
   $b = array_map("call_back_func", $array1, $array2);
   
   print_r($b);

?>

This will produce the following result −

Array ( [0] => different [1] => equal [2] => different [3] => equal )