What are the common errors that may occur when trying to inherit a class in PHP, and how can they be resolved?

Common errors that may occur when trying to inherit a class in PHP include misspelling the class name, not including the correct file that contains the parent class, and not properly using the `extends` keyword to indicate inheritance. To resolve these issues, make sure the class name is spelled correctly, include the file that contains the parent class using `require_once` or `include_once`, and use the `extends` keyword followed by the parent class name in the child class definition.

// Parent class definition
class ParentClass {
    // Class implementation
}

// Child class inheriting from ParentClass
require_once 'ParentClass.php'; // Make sure to include the file that contains the parent class
class ChildClass extends ParentClass {
    // Class implementation
}