<?php namespace Doctrine\Persistence; /** * Contract for classes that are potential listeners of a {@see NotifyPropertyChanged} * implementor. */ interface PropertyChangedListener { /** * Collect information about a property change. * * @param object $sender The object on which the property changed. * @param string $propertyName The name of the property that changed. * @param mixed $oldValue The old value of the property that changed. * @param mixed $newValue The new value of the property that changed. * * @return void */ public function propertyChanged($sender, $propertyName, $oldValue, $newValue); }