Should You Manually Check for mysqli_connect() Errors?

Manual Error Checking for mysqli_connect()

The PHP manual for mysqli_connect() recommends checking the return value and displaying error messages manually. However, this practice raises the question of whether it is necessary.

Arguments Against Manual Error Checking

• Duplicate Error Output: Manual error checking can result in duplicate error messages, as shown in the provided example.
• Less Informative Debugging: The manual "debugging" process provides less information than the automatic warning generated by mysqli_connect().
• Security Breach: Displaying connection errors reveals sensitive information such as database username and password.

Warning vs. Exception

It is better to configure mysqli to throw exceptions automatically. This alerts you to connection failures and other problems without the need for manual checking. Use:

mysqli_report(MYSQLI_REPORT_ERROR | MYSQLI_REPORT_STRICT);

mysqli_error() Limitations

mysqli_error() cannot display connection-related errors because it assumes a successful mysqli connection.

Conclusion

Based on the arguments presented, it is generally recommended to avoid checking for mysqli_connect() errors manually. The automatic warnings provide sufficient information for debugging, and using exceptions is a more robust method for handling connection issues.

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