<div class="codebody" id="code8147"> <?PHP /* 状态模式 允许一个对象在其内部状态改变时改变它的行为,对象看起来似乎修改了它所属的类 / interface State { public function handle($state); public function display(); } class Context { private $_state = null; public function __construct($state) { $this->setState($state); } public function setState($state) { $this->_state = $state; } public function request() { $this->_state->display(); $this->_state->handle($this); } } class StateA implements State { public function handle($context) { $context->setState(new StateB()); } public function display() { echo "state A "; } } class StateB implements State { public function handle($context) { $context->setState(new StateC()); } public function display() { echo "state B "; } } class StateC implements State { public function handle($context) { $context->setState(new StateA()); } public function display() { echo "state C "; } } // 实例化一下 $objContext = new Context(new StateB()); $objContext->request(); $objContext->request(); $objContext->request(); $objContext->request(); $objContext->request();
