#State This pattern is used in computer programming to encapsulate varying behavior for the same routine based on an object's state object. More…
$audioSystem = new AudioSystem(AudioSystem::RADIO);
echo $audioSystem->next() . PHP_EOL; // find next radio station
echo $audioSystem->back() . PHP_EOL; // back radio station
$audioSystem->setMode(AudioSystem::CD);
echo $audioSystem->next() . PHP_EOL; // next track
echo $audioSystem->back() . PHP_EOL; // back track##Diagram
##External links