public function before()
{
parent::before();
$this->_ctx =& Context::instance();
$this->_ctx->request($this->request)->response($this->response);
View::bind_global('ctx', $this->_ctx);
}
/**
* Main program
*/
public static function main()
{
$context = new Context();
$context->request();
$context->request();
$context->request();
$context = null;
}
$c->state = new NormalState();
echo "<Normal state>\n";
}
$c->counter -= 5;
return $c->counter;
}
}
class Context
{
const LIMIT = 10;
public $state;
public $counter;
public function __construct()
{
$this->counter = self::LIMIT;
}
public function request(int $i) : int
{
if ($i == 2) {
return $this->state->moveUp($this);
} else {
return $this->state->moveDown($this);
}
}
}
$context = new Context();
$context->state = new NormalState();
for ($i = 0; $i < 500; ++$i) {
$r = mt_rand(1, 3);
echo $context->request($r), "\n";
}
}
}
class StateB implements State
{
public function handle($context)
{
$context->setState(new StateC());
}
public function display()
{
echo "State B\n";
}
}
class StateC implements State
{
public function handle($context)
{
$context->setState(new StateA());
}
public function display()
{
echo "State C\n";
}
}
//实例化
$objContext = new Context(new StateB());
$objContext->request();
$objContext->request();
$objContext->request();
$objContext->request();
$objContext->request();
}
public function handle(Context $context)
{
echo 'concrete_b' . "<br>";
$context->setState(ConcreteStateA::getInstance());
}
}
class Context
{
// 环境角色
private $_state;
public function __construct()
{
// 默认为stateA
$this->_state = ConcreteStateA::getInstance();
}
public function setState(State $state)
{
$this->_state = $state;
}
public function request()
{
$this->_state->handle($this);
}
}
// client
$context = new Context();
$context->request();
$context->request();
$context->request();
$context->request();
