Numbers

Part of the Fundamentals section of Coddy's PHP journey — lesson 6 of 71.

Variables are containers that hold data values. They are used to store, manipulate, and display information within a program.

In short, a variable is like a memory unit that we can access by typing the name of the variable.

Each variable has a unique name and a value that can be of different types.

In PHP, all variable names must start with a dollar sign ($). To initialize a variable, we use the following format:

$variable_name = value;

Let's take a look at the different types of numbers:

int - an integer, such as 1 or -2.

float - a real number, such as 1.32 or 0.98.

For example:

To initialize a variable of type int with the name a and the value 3:

$a = 3;

To initialize a variable of type float with the name b and the value 13.2:

$b = 13.2;

Challenge

Easy

Write code that initializes a variable named var with the value 5.

Replace the ? with the correct value
Lines starting with # are comments - they explain what to do but don't affect your code
Only change the line that says $var = ?;

Cheat sheet

Variables are containers that hold data values. In PHP, variable names must start with a dollar sign ($).

To initialize a variable:

$variable_name = value;

Number types:

Examples:

$a = 3;      // int
$b = 13.2;   // float

Try it yourself

<?php
# Write your code below
$var = ?;

# Don't change the line below
echo "var = " . $var . "\n";
?>

Test yourself

This lesson includes a short quiz. Start the lesson to answer it and track your progress.