Lernen Logging Errors to Files | Logging, Debugging, and Production Strategies

Logging errors to files is an essential part of running PHP applications in production. Instead of displaying sensitive error details to users, you should capture errors in a structured log file for later analysis. This approach helps you track down bugs, monitor application health, and maintain security by keeping technical details out of public view. When logging errors, it is crucial to include key information: the timestamp of the error, the error message itself, and a stack trace showing where in the code the error occurred. This structured data makes it much easier to debug issues after the fact and to spot recurring problems over time.

log_error.php


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<?php
function logErrorToFile($exception) {
    $logFile = __DIR__ . '/error.log';
    $timestamp = date('Y-m-d H:i:s');
    $message = $exception->getMessage();
    $stackTrace = $exception->getTraceAsString();

    $logEntry = "[$timestamp] Error: $message\nStack trace:\n$stackTrace\n\n";
    file_put_contents($logFile, $logEntry, FILE_APPEND);
}

try {
    // Simulate an error
    throw new Exception("Database connection failed.");
} catch (Exception $e) {
    logErrorToFile($e);
    // Optionally, display a generic message to the user
    echo "An error occurred. Please try again later.";
}
?>

In the code above, the logErrorToFile function builds a structured log entry every time an exception is caught. The log entry starts with a timestamp so you know exactly when the error happened. It then records the error message, which describes what went wrong, followed by the full stack trace that shows the path the code took to reach the error. Each log entry is appended to the same error.log file, making it easy to review the sequence of errors over time. This format is especially useful for debugging and monitoring because it provides all the context needed to investigate and resolve issues efficiently.

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log_error.php


              1234567891011121314151617181920
            
<?php
function logErrorToFile($exception) {
    $logFile = __DIR__ . '/error.log';
    $timestamp = date('Y-m-d H:i:s');
    $message = $exception->getMessage();
    $stackTrace = $exception->getTraceAsString();

    $logEntry = "[$timestamp] Error: $message\nStack trace:\n$stackTrace\n\n";
    file_put_contents($logFile, $logEntry, FILE_APPEND);
}

try {
    // Simulate an error
    throw new Exception("Database connection failed.");
} catch (Exception $e) {
    logErrorToFile($e);
    // Optionally, display a generic message to the user
    echo "An error occurred. Please try again later.";
}
?>

War alles klar?

Danke für Ihr Feedback!

Abschnitt 3. Kapitel 1