Milind Daraniya

Error handling is a critical aspect of PHP development, as it allows you to gracefully handle unexpected situations and ensure your applications run smoothly. Proper error handling improves debugging, enhances user experience, and safeguards against potential security risks. In this post, we'll explore best practices for error handling in PHP, along with different types of errors you may encounter during development.

Types of Errors in PHP

1. Parse Errors: These occur when PHP encounters syntax errors in your code. They prevent the script from running altogether.
2. Fatal Errors: Fatal errors halt the script's execution and typically result from undefined functions or undefined classes.
3. Warnings: Warnings don't stop script execution but indicate potential issues in the code that should be addressed.
4. Notices: Notices are informational messages that highlight non-critical problems in the code.

Error Reporting Levels

PHP provides various error reporting levels to control which types of errors are displayed. The most common levels are:

error_reporting(E_ALL); // Display all types of errors
error_reporting(E_ERROR | E_WARNING | E_PARSE); // Display specific types of errors

Displaying Errors in Development Environment

During development, it's helpful to display errors on-screen for immediate feedback and debugging.

ini_set('display_errors', 1);
ini_set('display_startup_errors', 1);
error_reporting(E_ALL);

Logging Errors

In a production environment, avoid displaying errors to users, as this may expose sensitive information. Instead, log errors to a file or a centralized logging service.

ini_set('log_errors', 1);
ini_set('error_log', '/path/to/error.log');

Custom Error Handling

You can define custom error handlers in PHP using set_error_handler and set_exception_handler functions.

function customErrorHandler($errno, $errstr, $errfile, $errline)
{
    // Custom error handling logic
}

set_error_handler('customErrorHandler');

function customExceptionHandler($exception)
{
    // Custom exception handling logic
}

set_exception_handler('customExceptionHandler');

Graceful Degradation

Handle errors gracefully by providing meaningful error messages to users while still logging the detailed error information.

try {
    // Code that may throw an exception or trigger an error
} catch (Exception $e) {
    // Display a user-friendly error message
    echo 'Oops! Something went wrong. Please try again later.';
    // Log the error for further investigation
    error_log($e->getMessage(), 0);
}

Error Handling in Laravel

In Laravel, the framework handles error and exception handling for you. The App\Exceptions\Handler class is responsible for managing errors and exceptions.

Error handling is an essential aspect of PHP development, ensuring that your applications function correctly and providing useful feedback to both developers and users. Understanding the various types of errors, setting appropriate error reporting levels, and employing custom error handlers are vital steps to improve your code's reliability and maintainability.

Thank You!