What are the best practices for debugging PHP code that is no longer functioning after a server upgrade?

Issue: After a server upgrade, PHP code is no longer functioning. To debug this issue, check for any deprecated functions or syntax that may have changed in the new PHP version. Additionally, review error logs to identify any specific errors that are causing the code to fail. Fix: 

error_reporting(E_ALL);
ini_set('display_errors', 1);

// Your PHP code here

Keywords

server upgrade PHP code debugging error types libraries

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