What are the best practices for naming functions in PHP to avoid conflicts with special characters like the minus sign?

Special characters like the minus sign can cause conflicts in function names in PHP because they are not allowed in function names. To avoid this issue, it is best to use camelCase or snake_case naming conventions for functions. This will ensure that the function names are easily readable and do not contain any special characters.

function calculate_total() {
    // Function logic here
}