Why file operations matter in PHP - See It in Action

Why file operations matter

📖 Scenario: Imagine you run a small online store. You want to keep a list of products and their prices saved on your computer so you can check and update it anytime. Using file operations in PHP helps you save this list to a file and read it back later.

🎯 Goal: You will create a PHP script that saves a list of products and prices to a file, reads the file content, and shows it on the screen. This teaches you why file operations are important for saving and retrieving data.

📋 What You'll Learn

Create an array called products with exact entries: 'Apple' => 1.2, 'Banana' => 0.5, 'Cherry' => 2.5

Create a variable called filename and set it to 'products.txt'

Write the products array to the file products.txt in a readable format

Read the content from products.txt and store it in a variable called fileContent

Print the content of fileContent to display the saved products

💡 Why This Matters

🌍 Real World

Saving and reading data from files is useful for small apps that need to remember information between runs, like shopping lists or user settings.

💼 Career

Understanding file operations is important for backend developers and anyone working with data storage, backups, or simple databases.

1

Create the products array

Create an array called products with these exact entries: 'Apple' => 1.2, 'Banana' => 0.5, 'Cherry' => 2.5

PHP

<?php

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

Need a hint?

Use PHP array syntax with keys and values like ['key' => value].

2

Set the filename

Create a variable called filename and set it to the string 'products.txt'

PHP

 1.2, 'Banana' => 0.5, 'Cherry' => 2.5];

// Create the filename variable
// Your code here

Need a hint?

Use a simple string assignment like $filename = 'products.txt';.

3

Write products to the file

Write the products array to the file named filename in a readable format using file_put_contents and print_r with the second argument true to get a string

PHP

 1.2, 'Banana' => 0.5, 'Cherry' => 2.5];

$filename = 'products.txt';

// Write the products array to the file
// Your code here

Need a hint?

Use file_put_contents($filename, print_r($products, true)); to save the array as text.

4

Read and display the file content

Read the content from the file named filename using file_get_contents and store it in a variable called fileContent. Then print fileContent to display the saved products.

PHP

 1.2, 'Banana' => 0.5, 'Cherry' => 2.5];

$filename = 'products.txt';

file_put_contents($filename, print_r($products, true));

// Read the file content and print it
// Your code here

Need a hint?

Use $fileContent = file_get_contents($filename); and then print($fileContent);.