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chainOfResponsibility.php
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/
chainOfResponsibility.php
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<?php
interface Handler
{
public function setNext(Handler $handler): Handler;
public function handle(): string;
}
abstract class AbstractHandler implements Handler
{
private Handler $nextHandler;
public function setNext(Handler $handler): Handler
{
$this->nextHandler = $handler;
return $handler;
}
public function handle(): string
{
$string = $this->make() . '<br>';
if (isset($this->nextHandler)) {
$string .= $this->nextHandler->handle();
}
return $string;
}
abstract protected function make(): string;
}
class AbstractHandlerA extends AbstractHandler
{
protected function make(): string
{
return __METHOD__;
}
}
class AbstractHandlerB extends AbstractHandler
{
protected function make(): string
{
return __METHOD__;
}
}
class AbstractHandlerC extends AbstractHandler
{
protected function make(): string
{
return __METHOD__;
}
}
/**
* Client
*/
$abstractHandlerA = new AbstractHandlerA();
$abstractHandlerB = new AbstractHandlerB();
$abstractHandlerC = new AbstractHandlerC();
$abstractHandlerA
->setNext($abstractHandlerB)
->setNext($abstractHandlerC);
echo $abstractHandlerA->handle();