PHP Basics: Understanding Variables, Data Types, and Constants PHP is one of the most popular server-side scripting languages used to develop dynamic websites and web applications. Before diving into complex programming concepts, it’s crucial to understand the basics, especially variables, data types, and constants . 1. Variables in PHP Variables are used to store data that can be manipulated during the execution of a program. In PHP, a variable starts with the $ symbol followed by the variable name. <?php $name = "John Doe"; // String variable $age = 25; // Integer variable $is_student = true; // Boolean variable ?> Rules for naming PHP variables: Must start with a $ sign followed by a letter or underscore. Can contain letters, numbers, and underscores. Variable names are case-sensitive ( $name is different from $Name ). ...