// Set the default value for a text field $form->getElement('name')->setDefaults('John Smith'); // Set the default value for a checkbox $form->getElement('terms')->setChecked(true);In the first example, the default value for a text field called "name" is set to "John Smith". In the second example, a checkbox called "terms" is set to checked by default. Package/library: Although not specified in the description, it is likely that this is part of a larger PHP library or framework for working with web forms, such as Symfony, Laravel, or FormIt in MODX.