PHP exception handling: use exception logs to analyze production problems

PHP exception logging: By customizing the exception handler, exception details can be recorded to the log file, including exception class, error information and stack trace. Using these logs, production issues such as database connection errors can be quickly identified and resolved to ensure applications run smoothly.

PHP exception handling: using exception logs to analyze production problems

In complex web applications, exceptions are inevitable. PHP provides a powerful exception handling mechanism that helps us capture and record exceptions to assist us in quickly identifying and solving production problems.

Exception log

The exception log is a special log file that records all relevant information when an exception occurs. This information includes:

• Exception class
• Exception information
• Stack trace
• Time stamp when the exception occurred

Log Exception

In PHP, use the set_exception_handler() function to register a custom exception handler into the application. When an exception occurs, this handler will be called and perform the following actions:

public static function exceptionHandler(Throwable $exception): void
{
    // 将异常详细信息记录到日志文件中
    error_log("Error: " . $exception->getMessage() . PHP_EOL, 3, "errors.log");
    error_log("Stack trace: " . $exception->getTraceAsString() . PHP_EOL, 3, "errors.log");
}

Practical case

Problem:Database connection error

Exception log:

[2023-03-09 18:09:00] Error: SQLSTATE[HY000] [2002] Connection refused.
[2023-03-09 18:09:00] Stack trace:
#0 ...\classes\Database.php(23): mysqli->real_connect()
#1 ...\classes\User.php(15): Database->connect()
#2 ...\index.php(17): User->load()

This log clearly points out the exception caused by the database connection failure. We can easily identify the problem and take steps to resolve it.

Conclusion

By leveraging exception logs, PHP applications can collect vital information on production issues. This information helps quickly troubleshoot and resolve issues, ensuring the application runs smoothly.

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