What are the best practices for naming variables and functions in PHP to improve code clarity?

Naming variables and functions in a clear and descriptive manner is crucial for improving code clarity in PHP. Use meaningful names that reflect the purpose of the variable or function, avoiding abbreviations or overly generic names. Follow a consistent naming convention, such as camelCase or snake_case, to make the code more readable and maintainable. Additionally, avoid using reserved keywords or names that may conflict with built-in PHP functions or variables.

// Example of clear and descriptive variable and function naming
$customerName = "John Doe";
$orderId = 12345;

function calculateTotalPrice($price, $quantity) {
    return $price * $quantity;
}