In PHP 8.1 and later, mysqli began automatically throwing exceptions on errors, eliminating the need for manual error handling. This departure from the outdated practice of checking for errors manually and outputting custom messages has distinct implications for error handling in your applications.
The outdated approach, exemplified by if (!$conn), is no longer necessary or advisable. Both PDO and mysqli now possess the capability to raise errors automatically, just like other PHP functions. Therefore, explicit error checking code is superfluous.
Hiding Error Messages from Users
To conceal error messages from users, leverage the display_errors option. Setting it to 0 will suppress the display of any error whatsoever. For fine-grained control, set it to 1 on development environments and 0 on live servers.
Custom Error Pages for Exceptional Situations
A more user-friendly approach involves displaying a custom error page for irrecoverable errors. Employ an error handler to respond to all such errors by logging them, setting the HTTP status code to 500, and displaying a generic or customized error message.
Catching the Connection Error (Optional)
For specific scenarios, such as credential testing or implementing backup mechanisms, you may still need to explicitly catch the connection error using try..catch. If your error handling logic is separate from your regular connection code, this approach is appropriate.
In response to concerns about database passwords appearing in stack traces, PHP 8.2 introduced a solution. Its enhanced exception handling conceals the password from the stack trace, enhancing the security of your sensitive information.
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