What are some best practices for naming variables and file names in PHP scripts?

When naming variables and file names in PHP scripts, it is important to use descriptive and meaningful names that accurately represent the data or functionality they are associated with. This helps improve the readability and maintainability of the code. Additionally, it is recommended to follow a consistent naming convention, such as using camelCase for variables and file names, and avoiding special characters or spaces.

// Example of naming variables using camelCase
$firstName = "John";
$lastName = "Doe";

// Example of naming file with descriptive name
include_once("databaseConnection.php");