In WordPress, you can extend classes in a child theme by using the get_template_part() function or by using the override_class() function. Here are examples of each method:

  1. Using the get_template_part() function: You can use this function to include a template part from the child theme, which can be used to extend a class from the parent theme.
get_template_part( 'path/to/child-class', 'child-class' );

In this example, the path/to/child-class is the path to the child class file and ‘child-class’ is the name of the class being extended.

  1. Using the override_class() function: This function allows you to override a class from the parent theme with a class from the child theme.
function override_class_in_child_theme() {
    override_class( 'Parent_Class_Name', 'Child_Class_Name' );
}
add_action( 'after_setup_theme', 'override_class_in_child_theme' );

In this example, the Parent_Class_Name is the name of the class being overridden and the Child_Class_Name is the name of the class in the child theme.

It’s important to note that, when you extend a class you have to include the same methods and properties of the parent class otherwise it will break the class functionality and cause errors. It’s also important to be aware of the dependencies of the class being extended, as they may need to be loaded before the child class can be loaded.

Also, It’s best practice to use the child theme to extend the classes, as it separates the customizations from the parent theme, which makes it easier to update the parent theme without losing customizations.

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