array_walk() and array_map() both are used to work with the individual array element. array_walk() allows for operations to be performed on each element, but it does not return a new array. Instead, it operates directly on the original array and is typically used for side effects like printing, modifying elements in-place, or other operations where the result is not needed in a new array.
On the other hand, array_map() Returns a new array with modified values.
<?php
$arrWalk = array(1, 3, 2, 4, 2, 1, 5, 6, 3, 4, 5);
echo "Original Array<br>";
echo "<pre>";
print_r($arrWalk);
echo "</pre>";
echo "<br>After Doubling the array elements:<br><br>";
function doubleit($n)
{
echo "Double of {$n} is:" . $n * $n . "<br>";
}
array_walk($arrWalk, 'doubleit');
echo "<br><br>";
echo "<br>New Array after Array Map<br><br>";
function tripleIt($n)
{
return $n * $n * $n;
}
$tripleIta = array_map('tripleIt', $arrWalk);
echo "<pre>";
print_r($tripleIta);
echo "</pre>";
?>
OUTPUT
Original Array
Array
(
[0] => 1
[1] => 3
[2] => 2
[3] => 4
[4] => 2
[5] => 1
[6] => 5
[7] => 6
[8] => 3
[9] => 4
[10] => 5
)
After Doubling the array elements:
Double of 1 is:1
Double of 3 is:9
Double of 2 is:4
Double of 4 is:16
Double of 2 is:4
Double of 1 is:1
Double of 5 is:25
Double of 6 is:36
Double of 3 is:9
Double of 4 is:16
Double of 5 is:25
New Array after Array Map
Array
(
[0] => 1
[1] => 27
[2] => 8
[3] => 64
[4] => 8
[5] => 1
[6] => 125
[7] => 216
[8] => 27
[9] => 64
[10] => 125
)
All About Basic 