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Variables and Data Types

Explore how to declare and use variables in PHP, understand different data types such as null, boolean, integer, float, string, array, and learn the role of constants in efficient coding. This lesson helps you grasp how PHP handles variable types dynamically and prepares you to manage data effectively in your programs.

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 ...