array_map()

The array_map() function applies a user-defined function to each value of an array and returns a new array with the results. The user-defined function can be used to transform the values of the array in any way desired.

Syntax

array_map($function, $array1, $array2, ...)

• $function: The name of the user-defined function that will be applied to each value of the array.
• $array1: This is the first array that will be used as input to the callback function.
• $array2: This is an optional second array that will be used as input to the callback function.
• ...: This is an optional variadic argument that can be used to pass additional arrays to the callback function.

Example

Here is an example of how to use the array_map() function:

<?php

function double($number) {
  return $number * 2;
}

$array = [1, 2, 3, 4, 5];
$new_array = array_map('double', $array);
print_r($new_array);

?>

The above code results in the following output:

Array
(
    [0] => 2
    [1] => 4
    [2] => 6
    [3] => 8
    [4] => 10
)

Codebyte Example

The example below defines a function called addElements(), which takes two array elements as arguments, and returns the sum. Next, the code declares two arrays of numbers called $array1 and $array2 and passes them as arguments to the array_map() function. Run the code to see the output.

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