Why Does My Custom Error Message Not Show on mysqli_connect Failure in PHP 8.1 ?

Why Doesn't PHP Display a Custom Error Message on mysqli_connect Failure?

MySQLi, from PHP 8.1 onwards, presents a different approach to error handling. Instead of manual error detection via the traditional if (!$conn) condition, it natively raises an exception, eliminating the need for such checks.

Handling Connection Errors

The updated approach simplifies error handling; there's no need for manual if-checks. Instead, use try..catch blocks as needed for specific scenarios, such as testing user-provided credentials or implementing a backup strategy.

Custom Error Messages

Custom error messages are not recommended and should be removed from code. It's crucial to maintain consistency and handle errors generically for security and user experience.

Displaying User-Friendly Error Pages

To present a user-friendly error page, configure an error handler. Use set_exception_handler() to intercept exceptions and output a customizable error message, depending on whether display_errors is enabled or not.

HTTP Response Code

For irrecoverable server errors, an HTTP 500 code should be used. This indicates to clients that the server is experiencing issues, which is the standard practice for such situations.

Hiding Connection Credentials

To prevent database passwords from appearing in stack traces, upgrade to PHP 8.2 or later. It masks sensitive information from the stack trace, enhancing security.

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