What are some recommended resources or best practices for understanding and implementing class inheritance in PHP to avoid confusion and errors like the one described in the forum thread?

Issue: The error in the forum thread was caused by calling a method from a child class before the parent class had been included, resulting in a fatal error. To avoid this issue, it is important to ensure that parent classes are included before child classes that depend on them. Fix: To resolve this issue, make sure to include the parent class file before the child class file in your PHP code.

// Include parent class file first
include 'parent_class.php';

// Include child class file
include 'child_class.php';

// Instantiate child class
$child = new ChildClass();
$child->methodFromParent();