Why operators matter in PHP - See It in Action

Why operators matter

📖 Scenario: Imagine you are running a small shop. You want to calculate the total price of items bought by a customer, apply discounts, and check if the customer has enough money to pay.

🎯 Goal: You will create a simple PHP program that uses operators to calculate totals, apply discounts, and compare values to decide if the customer can pay.

📋 What You'll Learn

Create variables with exact values for item prices and quantities

Use arithmetic operators to calculate total cost

Use comparison operators to check if payment is enough

Print the final message showing the total and payment status

💡 Why This Matters

🌍 Real World

Operators are used in everyday calculations like shopping, banking, and budgeting to add, subtract, compare, and make decisions.

💼 Career

Understanding operators is essential for any programming job because they help manipulate data and control program flow.

1

DATA SETUP: Create item prices and quantities

Create three variables: $priceApple with value 2, $priceBanana with value 1, and $quantityApple with value 3.

PHP

<?php

// Create variables for prices and quantity
// Your code here

Need a hint?

Use the = operator to assign values to variables.

2

CONFIGURATION: Add quantity for bananas

Create a variable called $quantityBanana and set it to 5.

PHP

<?php

$priceApple = 2;
$priceBanana = 1;
$quantityApple = 3;

// Add quantity for bananas
// Your code here

Need a hint?

Remember to use = to assign the value.

3

CORE LOGIC: Calculate total cost and apply discount

Create a variable $total that calculates the total cost by multiplying prices and quantities for apples and bananas, then subtract 3 as a discount.

PHP

<?php

$priceApple = 2;
$priceBanana = 1;
$quantityApple = 3;
$quantityBanana = 5;

// Calculate total cost with discount
// Your code here

Need a hint?

Use parentheses to group calculations and * for multiplication.

4

OUTPUT: Check payment and print result

Create a variable $payment with value 10. Use an if statement to check if $payment is greater than or equal to $total. Print "Payment accepted. Change: " followed by the change amount if enough, otherwise print "Insufficient payment.".

PHP

<?php

$priceApple = 2;
$priceBanana = 1;
$quantityApple = 3;
$quantityBanana = 5;

$total = ($priceApple * $quantityApple) + ($priceBanana * $quantityBanana) - 3;

// Check payment and print result
// Your code here

Need a hint?

Use if, else, and comparison operator >=. Use print() to show messages.