Arrow functions (short closures) in PHP - Mini Project: Build & Apply

Arrow functions (short closures) in PHP

📖 Scenario: You are working on a small PHP script that processes a list of product prices. You want to apply a discount to each price and then display the discounted prices.

🎯 Goal: Build a PHP script that uses arrow functions (short closures) to apply a discount to each product price and then prints the discounted prices.

📋 What You'll Learn

Create an array called prices with the exact values: 100, 200, 300

Create a variable called discount and set it to 0.1 (which means 10%)

Use an arrow function inside array_map to calculate discounted prices

Print the resulting discounted prices array

💡 Why This Matters

🌍 Real World

Applying discounts or taxes to product prices is common in online stores and billing systems.

💼 Career

Understanding arrow functions helps write concise and modern PHP code, which is valuable for web developers.

1

Create the prices array

Create an array called prices with the exact values 100, 200, and 300.

PHP

<?php

// Create the array called prices with values 100, 200, 300
// Your code here

Need a hint?

Use square brackets [] to create an array in PHP.

2

Set the discount rate

Create a variable called discount and set it to 0.1 to represent a 10% discount.

PHP

<?php

$prices = [100, 200, 300];

// Create a variable called discount and set it to 0.1
// Your code here

Need a hint?

Use the = sign to assign the value 0.1 to the variable discount.

3

Calculate discounted prices using an arrow function

Use array_map with an arrow function to create a new array called discountedPrices. The arrow function should take each price and return the price after subtracting the discount (price minus price times discount).

PHP

<?php

$prices = [100, 200, 300];
$discount = 0.1;

// Use array_map with an arrow function to create discountedPrices
// Your code here

Need a hint?

Use fn($price) => $price - $price * $discount as the arrow function inside array_map.

4

Print the discounted prices

Print the discountedPrices array using print_r to display the discounted prices.

PHP

 $price - $price * $discount, $prices);

// Print the discountedPrices array
// Your code here

Need a hint?

Use print_r($discountedPrices); to print the array in a readable format.