PHP Arrow Functions

Arrow functions, also known as “short closures”, is a new feature introduced in PHP 7.4 that provides a more concise syntax for defining anonymous functions. Arrow functions allow you to define a function in a single line of code, making your code more readable and easier to maintain.

Syntax:

$fn = $fun(x) => some_operations

Example 1: In this example, we will declare an array and use the array_reduce() method and arrow function to find the sum of array elements.

PHP

<?php

// Declare an array
$arr = [1, 2, 3, 4, 5, 6, 7];

$sum = array_reduce($arr, fn($carry, $item) => $carry + $item);

echo $sum;
?>

Output:

28

Example 2: In this example, we will declare an array and use the array_map() function to display array elements in multiple of 2.

PHP

<?php

$arr = [1, 2, 3, 4, 5, 6, 7];
$res = array_map(fn($n) => $n * 2, $arr);
print_r($res);
?>

Output:

Array
( 
       [0] => 2 
       [1] => 4 
       [2] => 6 
       [3] => 8 
       [4] => 10 
       [5] => 12 
       [6] => 14 
)

Reference: https://www.php.net/manual/en/functions.arrow.php