Are there best practices for handling timezones in PHP scripts to ensure consistent output across different instances and classes?

When working with timezones in PHP scripts, it is essential to set the default timezone to avoid inconsistencies in date and time calculations. One best practice is to set the timezone at the beginning of your script using the `date_default_timezone_set()` function. This ensures that all date and time functions in your script will use the specified timezone.

// Set the default timezone to UTC
date_default_timezone_set('UTC');

// Your PHP script code here
// Now all date and time functions will use UTC timezone