SplFileObject reverse reader replaces file_get_contents/file() for large log performance<br><br />Custom Error Handler: captures PHP errors to a local log when server logs aren't accessible<br><br />Security: log injection prevention (CWE-117), path traversal validation, shell_exec removed<br><br />Improved error grouping: dynamic parts (client IP:port, PID) normalized for better deduplication<br><br />Grouped error view: identical errors consolidated with occurrence counts, first/last seen timestamps