What are the best practices for naming variables and functions in PHP to avoid errors like case sensitivity?

Variable and function names in PHP are case-sensitive, meaning that $variable and $Variable are considered two different variables. To avoid errors related to case sensitivity, it is recommended to follow a consistent naming convention, such as using camelCase or snake_case for variables and functions. By sticking to a specific naming style, you can prevent confusion and ensure that your code is easier to read and maintain.

$myVariable = "Hello, world!";

function myFunction() {
    return "This is a function.";
}