CODEWITHSUNDEEP
phpdictionary
paulie.jvenuez
paulie.jvenuez

Reputation: 295

map function to change array values?

I want to know if there is a map function or similar to use with array values? Say I have the following array..

$nums = array(1, 2, 3, 4, 5, 6, 7, 8, 9, 10);

I want to multiply these values by 5, changing the array values where my expected output would be.

Array
(
    [0] => 5
    [1] => 10
    [2] => 15
    ...... and so on
 )

Is there a function i can use to do this?

Upvotes: 1

Views: 205

Answers (3)

hwnd
hwnd

Reputation: 70732

There is no specific map function, but you can create your own using array_map or a foreach loop.

function map($n) {
   return $n*5;
}

$nums = array(1, 2, 3, 4, 5, 6, 7, 8, 9, 10);
print_r(array_map(map, $nums));

Or

function map($n, $array) {
   foreach ($array as &$val) {
      $val *= $n;
   }
   return $array;
}

$nums = array(1, 2, 3, 4, 5, 6, 7, 8, 9, 10);
print_r(map(5, $nums));

Output

Array
(
    [0] => 5
    [1] => 10
    [2] => 15
    [3] => 20
    [4] => 25
    [5] => 30
    [6] => 35
    [7] => 40
    [8] => 45
    [9] => 50
)

Upvotes: 1

Gergo Erdosi
Gergo Erdosi

Reputation: 42043

Yes, and it is called array_map:

$nums = array_map(function($number) { return $number * 5; }, $nums);

Or with array_walk:

array_walk($nums, function(&$number) { $number *= 5; });

Upvotes: 4

Sterling Archer
Sterling Archer

Reputation: 22405

You can easily iterate over the array.

foreach ($nums as &$value) {
  $value *= 5;
}

A little more complicated, you can use array_map() as well.

array_map(function($x) { return $x * 5; }, $nums);

Upvotes: 1

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