PHP array_map Function: Usage & Examples

1 year ago
Liam
1 minute

The array_map function is used to apply a callback function to each element in an array. It will return a new array where each element is the result of applying the callback function to each element of the original array.

The syntax of the array_map function is as follows:

Use the callback function to process each element in the arrays provided as arguments, such as array1 and array2.

The sample code is shown below:

function square($n) {
  return $n * $n;
}

$numbers = [1, 2, 3, 4, 5];
$squaredNumbers = array_map("square", $numbers);

print_r($squaredNumbers);

Output:

Array
(
    [0] => 1
    [1] => 4
    [2] => 9
    [3] => 16
    [4] => 25
)

In the example above, we defined a callback function called “square” to calculate the square of a number. Then, we applied this callback function to each element in the $numbers array using the array_map function, resulting in a new array called $squaredNumbers which contains the square values of each element. Finally, we printed the contents of the new array using the print_r function.

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