PHP - Function array_map()


Advertisements


Syntax

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

Definition and Usage

Returns an array containing all the elements of array1 after applying the callback function to each one. The number of parameters that the callback function accepts should match the number of arrays passed to the array_map().

Parameters

Parameter Description
callback Required. The name of the user-made function, or null.
array1 Required. Specifies an array.
array2 Optional. Specifies an array.
array3 Optional. Specifies an array.

Return Values

Returns an array containing all the processed elements of array1.

Example

Try out following example −

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

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 )

php_function_reference.htm

Advertisements