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Variables and Data Types

Variables and Data Types

This lesson discusses how you can use variables to store data and the various types of these variables, i.e., data types.

We'll cover the following...

Variables

A variable in any programming language is a named piece of computer memory, containing some information inside. Variables are one of the essential parts of a computer program. You can declare a variable in PHP using a $ sign followed by its name, e.g., $myVariable.

Consider the following PHP code where we store data in two variables and print them. The $str variable contains a string, and the $num variable contains an integer data type. We will discuss strings and integers later in the lesson.

PHP
<?php
$str = "I will be back by";
$num = 5;
  
echo $str;
echo " "; // Output: I will be back by
echo $num; // Output: 5
?>

Data types

Along with the name of variables, their sizes may vary too. In most programming languages (like C++ and Java) you can use different ...