Array filter function in PHP - Mini Project: Build & Apply

Array filter function

📖 Scenario: You work in a fruit store. You have a list of fruits with their prices. You want to find only the fruits that cost more than 2 dollars.

🎯 Goal: Build a PHP program that filters an array of fruits to keep only those with prices greater than 2 dollars using the array_filter function.

📋 What You'll Learn

Create an associative array called fruits with exact entries: 'apple' => 3, 'banana' => 1, 'cherry' => 5, 'date' => 2, 'elderberry' => 4

Create a variable called price_limit and set it to 2

Use array_filter with a callback function that keeps fruits with price greater than price_limit

Print the filtered array using print_r

💡 Why This Matters

🌍 Real World

Filtering arrays is common when you want to select only certain data from a list, like filtering products by price in an online store.

💼 Career

Understanding how to filter arrays helps in data processing tasks, backend development, and working with APIs that return lists of items.

1

Create the fruits array

Create an associative array called fruits with these exact entries: 'apple' => 3, 'banana' => 1, 'cherry' => 5, 'date' => 2, 'elderberry' => 4

PHP

<?php

// Create the fruits array with exact entries
// Your code here

Need a hint?

Use square brackets [] to create the array and separate entries with commas.

2

Set the price limit

Create a variable called price_limit and set it to 2

PHP

 3, 'banana' => 1, 'cherry' => 5, 'date' => 2, 'elderberry' => 4];

// Create price_limit variable and set to 2
// Your code here

Need a hint?

Use the = sign to assign the value 2 to price_limit.

3

Filter fruits by price

Use array_filter with a callback function that keeps fruits with price greater than price_limit. Store the result in a variable called expensive_fruits

PHP

 3, 'banana' => 1, 'cherry' => 5, 'date' => 2, 'elderberry' => 4];
$price_limit = 2;

// Use array_filter to keep fruits with price > price_limit
// Your code here

Need a hint?

Use an anonymous function with use ($price_limit) to access the variable inside the callback.

4

Print the filtered fruits

Print the expensive_fruits array using print_r

PHP

 3, 'banana' => 1, 'cherry' => 5, 'date' => 2, 'elderberry' => 4];
$price_limit = 2;

$expensive_fruits = array_filter($fruits, function($price) use ($price_limit) {
    return $price > $price_limit;
});

// Print the expensive_fruits array
// Your code here

Need a hint?

Use print_r($expensive_fruits); to display the filtered array.