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Identify the deprecated built-in functions: Check the error logs to identify the built-in functions that are causing the "Deprecated passing null to parameter" error.

Replace the function name: Replace the deprecated function names with their corresponding new names. For example, the "each" function has been replaced with "foreach", and "implode" has been replaced with "join".

Check the function arguments: Verify the function arguments to ensure that they match the new function signature. Some built-in functions in PHP 8.1 may have changed their parameter order or removed parameters.

Test the code: Test the changes thoroughly to ensure that the application is working as expected. It is recommended to perform regression testing on all affected features to catch any side effects of the changes.

Address related errors: The replacement of the deprecated functions may result in errors related to other functions or syntax. Resolve these errors as needed.

Deploy the changes: Deploy the changes to the production environment after thorough testing.

Update documentation: Update the documentation to reflect the changes made to the application code, including the replacement of deprecated functions. This ensures that future developers are aware of the changes made.