Variable naming rules in PHP - Mini Project: Build & Apply

Variable naming rules

📖 Scenario: Imagine you are organizing your personal notes in a notebook. Each note has a clear title so you can find it easily later. In programming, variables are like these notes. They need clear names so the computer and you understand what they hold.

🎯 Goal: You will create variables with proper names following PHP rules. Then, you will print their values to see the result.

📋 What You'll Learn

Create variables with valid PHP names

Assign simple values to these variables

Print the variables to show their values

💡 Why This Matters

🌍 Real World

Variable naming is important in all programming tasks to keep code clear and understandable.

💼 Career

Good variable names help developers read and maintain code, which is essential in any programming job.

1

Create variables with valid names

Create three variables called $name, $age, and $is_student. Assign the values "Alice", 23, and true to them respectively.

PHP

# Create variables $name, $age, and $is_student with values "Alice", 23, and true
# Your code here

Need a hint?

Remember, PHP variables start with a dollar sign $ followed by letters, numbers, or underscores. They cannot start with a number.

2

Add a variable for height

Create a variable called $height_cm and assign it the value 170.

PHP

<?php
$name = "Alice";
$age = 23;
$is_student = true;
# Create variable $height_cm with value 170
# Your code here

Need a hint?

Use underscores to separate words in variable names for readability.

3

Use variables in a message

Create a variable called $message that combines $name and $age into the string: "Alice is 23 years old." Use double quotes and variable interpolation.

PHP

<?php
$name = "Alice";
$age = 23;
$is_student = true;
$height_cm = 170;
# Create $message with "Alice is 23 years old."
# Your code here

Need a hint?

Use double quotes to include variables directly inside strings in PHP.

4

Print the message

Use echo to print the variable $message.

PHP

<?php
$name = "Alice";
$age = 23;
$is_student = true;
$height_cm = 170;
$message = "$name is $age years old.";
# Print $message
# Your code here

Need a hint?

Use echo to show text or variable values on the screen in PHP.