The main purpose of a constructor in a PHP class is to initialize the object's properties when an object of the class is created.

The main purpose of a constructor in a PHP class is to initialize the object's properties. The correct option is "properties." When an object of the class is created, the constructor is automatically called, allowing you to provide initial values or perform setup tasks for the object's properties. For more information, consult the PHP documentation on constructors: http://php.net/manual/en/language.oop5.decon.php