How Can I Handle Parse and Fatal Errors in PHP?

Handling Parse and Fatal Errors with Custom Error Handling in PHP

Custom error handlers provide a mechanism to manage errors and exceptions in PHP applications. However, conventional wisdom suggests that parse and fatal errors cannot be handled by such handlers.

Utilizing Shutdown Functions

The key to handling parse and fatal errors lies in employing shutdown functions with register_shutdown_function(). This function calls a specified PHP routine when the script execution concludes. By defining a shutdown function, it becomes possible to intercept any errors that caused an abrupt termination of the script.

An example of a rudimentary implementation is presented below:

register_shutdown_function("shutdownHandler");

function shutdownHandler() {
    $lasterror = error_get_last();
    if ($lasterror['type'] >= E_ERROR) {
        $error = "[SHUTDOWN] lvl: " . $lasterror['type'] . " | msg:" . $lasterror['message'] . " | file:" . $lasterror['file'] . " | ln:" . $lasterror['line'];
        mylog($error, "fatal");
    }
}

Potential Issues and Caveats

There is a possibility of duplicate error logging if both the custom error handler (errorHandler()) and the shutdown handler (shutdownHandler()) capture the same error. To mitigate this, a comprehensive logging mechanism that eliminates redundant entries is advisable.

Implementation Considerations

In order to prepend the custom error handling snippet to all PHP scripts automatically, one can leverage the auto_prepend_file directive in the php.ini configuration file. However, it is crucial to ensure the proper location of the error handling script.

Conclusion

By utilizing shutdown functions, it becomes feasible to handle even parse and fatal errors in PHP applications. This approach empowers developers with the ability to centralize error logging and handling, improving application stability and user experience.

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