What are the best practices for sharing functions between servers in PHP to avoid fatal errors like undefined function calls?

When sharing functions between servers in PHP, it is important to use a consistent deployment strategy to avoid fatal errors like undefined function calls. One way to achieve this is by using a version control system like Git to manage the codebase and ensure that all servers have the same set of functions available. Additionally, using autoloading or including a common file with the shared functions can help prevent undefined function errors.

// Shared functions file
include_once 'shared_functions.php';

// Call the shared function
echo sharedFunction();