What is the best practice for setting the default timezone in PHP scripts?

When working with date and time functions in PHP, it is important to set the default timezone to avoid unexpected results or errors. The best practice is to set the default timezone at the beginning of your PHP scripts using the `date_default_timezone_set()` function with the desired timezone identifier. 

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

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timezone default setting PHP scripts best practice

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