One article explains in detail how to implement chain of responsibility design pattern in PHP (with code examples)

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PHP implements the responsibility chain design pattern

Reference article address:Let’s talk in depth about the "responsibility chain pattern" of the design pattern tool (with go implementation Process)

Just read the reference article for the implementation principle. The original text is implemented in Go language. Here is a PHP version of the implementation, and the framework uses hyperf.

File structure:

IndexController is the calling end, UserInfoEntity user entity is used to store user information, and flow contains various processing processes

IndexController

setName('zhangsan'); $startHandler->setNextHandler(new Reception()) ->setNextHandler(new Clinic()) ->setNextHandler(new Cashier()) ->setNextHandler(new Pharmacy()); $startHandler->execute($userInfo); } }

UserInfoEntity

name; } public function setName(string $name): UserInfoEntity { $this->name = $name; return $this; } public function isRegistrationDone(): bool { return $this->registrationDone; } public function setRegistrationDone(bool $registrationDone): UserInfoEntity { $this->registrationDone = $registrationDone; return $this; } public function isDoctorCheckUpDone(): bool { return $this->doctorCheckUpDone; } public function setDoctorCheckUpDone(bool $doctorCheckUpDone): UserInfoEntity { $this->doctorCheckUpDone = $doctorCheckUpDone; return $this; } public function isMedicineDone(): bool { return $this->medicineDone; } public function setMedicineDone(bool $medicineDone): UserInfoEntity { $this->medicineDone = $medicineDone; return $this; } public function isPaymentDone(): bool { return $this->paymentDone; } public function setPaymentDone(bool $paymentDone): UserInfoEntity { $this->paymentDone = $paymentDone; return $this; } }

HandlerInterface

      
AbstractHandler
      
nextHandler = $handler; return $this->nextHandler; } public function execute(UserInfoEntity $info) { if (! empty($this->nextHandler)) { try { $this->nextHandler->do($info); } catch (\Exception $e) { return; } return $this->nextHandler->execute($info); } } public function do(UserInfoEntity $info) { // TODO: Implement do() method. } }
      
StartHandler
      

      
Cashier
      
setPaymentDone(true); } }
      
Clinic
      
setDoctorCheckUpDone(true); } }
      
Pharmacy
      
setMedicineDone(true); } }
      
Reception
      
setRegistrationDone(true); } }
      
Write a unit test and run the index method of indexController. The results are as follows:
      

      
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