How do you declare variables and assign values in PHP? Provide examples.

In PHP, declaring variables and assigning values to them is a fundamental concept. Variables are used to store data that can be accessed and manipulated throughout the program. Here's an in-depth explanation of how to declare variables and assign values in PHP: To declare a variable in PHP, you start with a dollar sign (`$`) followed by the variable name. Variable names are case-sensitive and can consist of letters, numbers, and underscores. However, they must start with a letter or an underscore. Here's an example of declaring a variable: ``` php`$name;` ``` In the above example, we have declared a variable named `$name` without assigning it any value. It is important to note that PHP does not require explicit type decla....