Explain the basic syntax and structure of PHP code.

The basic syntax and structure of PHP code follow a set of rules that define how PHP scripts are written. Understanding this syntax is fundamental for writing PHP code effectively. Let's dive into the details: 1. Opening and Closing Tags: * PHP code is enclosed within `<?php` and `?>` tags. * These tags indicate the start and end of PHP code within an HTML document. 2. Outputting Content: * To output content or variables to the browser, you use the `echo` statement or `print` function. * For example, `echo "Hello, World!";` or `print("Welcome!");`. 3. Variables: * Variables in PHP start with a dollar sign (`$`) followed by the variable name. * Variable names are case-sensitive and can contain letters, numbers, and underscores. * Variables do not require explicit type declaration. * Example: `$name = "John Doe";`. 4. Comments:....