PHP array_map() Function

Hello dear readers! welcome back to another section of our tutorial on PHP. In this tutorial, we will be studying about the PHP Function array_map().

PHP array_map() function returns an array containing all of the elements of array1 after applying the callback function to each of them.

Syntax

Following below is the syntax to use this function -

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

READ: PHP array_keys() Function

Parameter Details

Sr.No	Parameter & Description
1	callback(Required) The name of the user-made function, or null.
2	array1(Required) It specifies an array.
3	array2(Optional) It specifies an array.
4	array3(Optional) It specifies an array.

Return Value

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

Example

Try out the below example -

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

Output

When the above code is executed, it will produce the following result -

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

Example2

Try out the below example 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);

?>

Output

When the above code is executed, it will produce the following result -

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

READ: PHP Regular Expressions

Alright guys! This is where we are rounding up for this tutorial post. In our next tutorial, we will discuss about the array_merge() Function in PHP.

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