PHP error types and levels - Mini Project: Build & Apply

Understanding PHP Error Types and Levels

📖 Scenario: You are building a simple PHP script to learn about different types of errors and how PHP reports them. This will help you understand how to spot and fix problems in your PHP code.

🎯 Goal: Create a PHP script that defines error reporting levels, triggers different types of errors, and displays the error messages.

📋 What You'll Learn

Create variables and settings to control error reporting

Trigger different PHP error types: notice, warning, and fatal error

Display error messages according to the error reporting level

💡 Why This Matters

🌍 Real World

Understanding PHP error types helps you debug your web applications and fix problems quickly.

💼 Career

PHP developers must know how to handle errors to write reliable and maintainable code.

1

Set up error reporting levels

Write PHP code to set the error reporting level to show all errors using error_reporting(E_ALL); and enable displaying errors with ini_set('display_errors', '1');.

PHP

<?php
// Set error reporting to show all errors
// Your code here

Need a hint?

Use error_reporting(E_ALL); to report all errors and ini_set('display_errors', '1'); to show them on the screen.

2

Trigger a notice error

Add PHP code that tries to use an undefined variable called $undefinedVar to trigger a notice error.

PHP

<?php
error_reporting(E_ALL);
ini_set('display_errors', '1');
// Use the variable $undefinedVar to trigger a notice error
// Your code here

Need a hint?

Simply try to print $undefinedVar without defining it first.

3

Trigger a warning error

Add PHP code to include a file named missingfile.php using include to trigger a warning error.

PHP

<?php
error_reporting(E_ALL);
ini_set('display_errors', '1');
echo $undefinedVar;
// Include a missing file to trigger a warning error
// Your code here

Need a hint?

Use include 'missingfile.php'; to cause a warning because the file does not exist.

4

Trigger a fatal error

Add PHP code to call a function named undefinedFunction() that does not exist to trigger a fatal error. Then print "End of script" using echo.

PHP

<?php
error_reporting(E_ALL);
ini_set('display_errors', '1');
echo $undefinedVar;
include 'missingfile.php';
// Call undefinedFunction() to trigger a fatal error
// Then print "End of script"
// Your code here

Need a hint?

Call undefinedFunction(); to cause a fatal error. The last echo will not run because of the fatal error.