Custom Error Handling

Custom Error Handling in PHP

Custom error handling in PHP allows you to define your own error handling functions to manage errors and exceptions based on your application's requirements. This enables you to tailor error messages, log errors, and gracefully handle unexpected situations. Here's how you can implement custom error handling in PHP:

Using set_error_handler()

The set_error_handler() function in PHP lets you define a custom error handling function. This function will be called when PHP encounters an error that matches the type and severity you specify. Here's an example:

function customErrorHandler($errno, $errstr, $errfile, $errline) {
    // Your custom error handling logic
    echo "Error: [$errno] $errstr in $errfile on line $errline\n";
}

set_error_handler("customErrorHandler");

In this example:

• customErrorHandler is the custom error handling function.
• $errno is the error number.
• $errstr is the error message.
• $errfile is the file in which the error occurred.
• $errline is the line number where the error occurred.

You can modify the customErrorHandler function to log errors to a file, send them via email, or perform other actions based on your application's requirements.

Using set_exception_handler()

You can also create a custom exception handling function using set_exception_handler() to handle uncaught exceptions:

function customExceptionHandler($exception) {
    // Your custom exception handling logic
    echo "Uncaught Exception: " . $exception->getMessage() . "\n";
}

set_exception_handler("customExceptionHandler");

In this example:

• customExceptionHandler is the custom exception handling function.
• $exception is the exception object, which contains information about the exception, such as the error message and stack trace.

You can use the customExceptionHandler function to log exceptions, display a user-friendly error page, or take other actions when an uncaught exception occurs.

Restoring Default Error Handling

If you ever need to revert to the default error handling provided by PHP, you can do so by calling restore_error_handler():

restore_error_handler();

Conclusion

Custom error handling in PHP empowers you to manage errors and exceptions in a way that best suits your application. By defining custom error and exception handling functions, you can log errors, send notifications, or gracefully handle issues to improve the robustness and user-friendliness of your PHP applications.