ارئه من تو کدرکانف3 که هدف اصلیم توضیح مفاهیم زیر است: Inversion of control Dependency injection Constructor injection Property injection Setter injection Interface/trait injection Dependency inversion principle Dependency injection container Service locator

1. ‫از‬new class‫و‬Dependency injection
‫تا‬PSR-11‫و‬Auto-wiring

2. ‫عربی‬ ‫میالد‬
9‫نویس‬ ‫برنامه‬ ‫سال‬PHP
‫دهنده‬ ‫توسعه‬BSS/CRM
milad.arabi@gmail.com
https://twitter.com/ooghry
https://www.linkedin.com/in/miladarabi/

3. PSR-7‫و‬middleware-‫ها‬‫معرفی‬ ‫و‬Zend Expressive
bit.ly/coderconfpsr7

5. <?php
class example
{
public function create()
{
$db = new PDO($dsn , 'username', 'password');
$id = $db->insert(/* $data */);
$mailer=new mailer(/* $transport */);
$mailer->send();
//……
return $id;
}
}

6. global
db_setup.php
<?php
$db = new PDO($dsn , 'username', 'password');
<?php
class example
{
public function create()
{
global $db;
global $mailer;
$id = $db->insert(/* $data */);
$mailer->send();
//……
return $id;
}
}

7. global
db_setup.php
<?php
$db = new PDO($dsn , 'username', 'password');
<?php
class example
{
public function create()
{
global $db;
global $mailer;
$id = $db->insert(/* $data */);
$db = null;
$mailer->send();
//……
return $id;
}
}

8. Inversion of control
‫در‬،‫افزار‬‫نرم‬ ‫مهندسی‬‫کنترل‬ ‫وارونگی‬‫اختصاصی‬ ‫بخشهای‬ ‫که‬ ‫کند‬‫می‬ ‫توصیف‬ ‫را‬ ‫طراحی‬ ‫از‬ ‫ای‬‫گونه‬‫نوشته‬
‫یک‬ ‫از‬ ‫را‬ ‫کنترل‬ ‫جریان‬ ‫ای‬‫رایانه‬ ‫برنامه‬ ‫یک‬ ‫شده‬‫کتابخانه‬‫دریافت‬ ‫عمومی‬ ‫بازاستفاده‬ ‫قابلیت‬ ‫با‬‫کند‬‫می‬.
https://fa.wikipedia.org/wiki/%D9%88%D8%A7%D8%B1%D9%88%D9%86%DA%AF%DB%8C_%DA%A9%D9%86%D8%AA%D8%B1%D9%84
‫آن‬ ‫به‬ ‫آبجکت‬ ‫یک‬ ‫های‬ ‫وابستگی‬ ‫وقتی‬‫شود‬ ‫داده‬‫خ‬ ‫های‬ ‫وابستگی‬ ‫ساختن‬ ‫مسئول‬ ‫آبجکت‬ ‫آن‬ ‫و‬،‫نباشد‬ ‫ود‬
‫طراحی‬ ‫اصل‬ ‫ما‬inversion of control‫کردیم‬ ‫اجرایی‬ ‫را‬.

9. Dependency injection
‫وابستگی‬ ِ‫تزریق‬(‫انگلیسی‬ ‫به‬:Dependency Injection (DI))‫در‬‫الگوی‬ ،‫شیءگرا‬ ‫نویسی‬‫برنامه‬
‫نیازمندی‬ ِ‫تحلیل‬ ‫از‬ ‫رفتار‬ ِ‫جداکردن‬ ِ‫اصلی‬ ٔ‫ه‬‫قاعد‬ ‫با‬ ‫طراحیست‬(‫انگلیسی‬ ‫به‬:Dependency
Resolution:)‫فنی‬‫افزاری‬‫نرم‬ ِ‫مستقل‬ ‫بسیار‬ ِ‫های‬‫مؤلفه‬ ِ‫کردن‬‫تجزیه‬ ‫برای‬(‫انگلیسی‬ ‫به‬:Software
Components.)‫به‬‫خا‬ ‫های‬‫وابستگی‬ ‫تزریق‬ ‫جهت‬ ‫است‬ ‫الگویی‬ ،‫وابستگی‬ ‫تزریق‬ ‫خالصه‬ ‫صورت‬‫رجی‬
‫کالس‬ ‫درون‬ ‫در‬ ‫ها‬‫وابستگی‬‫آن‬ ‫از‬ ‫مستقیم‬ ‫استفاده‬ ‫بجای‬ ،‫آن‬ ‫به‬ ‫کالس‬ ‫یک‬.
https://fa.wikipedia.org/wiki/%D8%AA%D8%B2%D8%B1%DB%8C%D9%82_%D9%86%DB%8C%D8%A7%D8%B2%D9%85%D9%86%D8%AF%DB%8C
dependency injection‫به‬‫چیز‬ ‫به‬ ‫آبجکتی‬ ‫اگر‬ ‫که‬ ‫است‬ ‫معنی‬ ‫این‬(‫یا‬ ‫آرایه‬ ‫یا‬ ‫آبجکت‬)...‫دیگری‬
‫آبجکت‬ ‫برای‬ ‫را‬ ‫آن‬ ‫نویس‬ ‫برنامه‬ ‫عنوان‬ ‫به‬ ‫ما‬ ،‫آبجکت‬ ‫داخل‬ ‫در‬ ‫آن‬ ‫ساخت‬ ‫جای‬ ‫به‬ ‫داشت‬ ‫احتیاج‬
‫ارسال‬(inject)‫کنیم‬.

10. Dependency injection
1. Constructor injection
2. Property injection
3. Setter injection
4. Interface injection

11. 1.Constructor injection:
<?php
class example
{
protected $db;
private $mailer;
public function __construct(PDO $db, mailer $mailer)
{
$this->db = $db;
$this->mailer = $mailer;
}
public function create()
{
$id = $this->db->insert(/* $data */);
$this->mailer->send();
//…
return $id;
}
}

12. 2.Property injection :
<?php
class example
{
public $db; //$example->db=new PDO();
public $mailer; //$example->mailer=new mailer;
public function create()
{
$id = $this->db->insert(/* $data */);
$this->mailer->send();
//…
return $id;
}
}

13. 3.Setter injection:
<?php
class example
{
protected $db;
protected $mailer;
public function setDb(PDO $db)
{
$this->db = $db;
}
public function setMailer(mailer $mailer)
{
$this->mailer = $mailer;
}
public function create()
{
$id = $this->db->insert(/* $data */);
$this->mailer->send();
//…
return $id;
}
}

14. 4.Interface injection
<?php
interface setDbInterface
{
public function setDb(PDO $db);
}
interface setMailerInterface
{
public function setMailer(mailer $mailer);
}
class example implements setDbInterface, setMailerInterface
{
protected $db;
protected $mailer;
public function setDb(PDO $db)
{
$this->db = $db;
}
public function setMailer(mailer $mailer)
{
$this->mailer = $mailer;
}
public function create()
{
$id = $this->db->insert(/* $data */);
$this->mailer->send();
//…
return $id;
}
}

15. 4.Interface Trait injection
<?php
trait setDbTrait
{
public function setDb(PDO $db)
{
$this->db = $db;
}
}
trait setMailerTrait
{
public function setMailer(mailer $mailer)
{
$this->mailer = $mailer;
}
}
class example
{
use setDbTrait , setMailerTrait;
protected $db;
protected $mailer;
public function create()
{
$id = $this->db->insert(/* $data */);
$this->mailer->send();
//…
return $id;
}
}

16. SOLID - Dependency inversion principle
•‫انتزاعات‬ ‫به‬ ‫باید‬ ‫دو‬ ‫هر‬ ،‫باشند‬ ‫وابسته‬ ‫پایین‬ ‫سطح‬ ‫ماژولهای‬ ‫به‬ ‫نباید‬ ‫باال‬ ‫سطح‬ ‫های‬‫ماژول‬(abstract
‫و‬interface)‫باشند‬ ‫وابسته‬.
•‫باش‬ ‫انتزاعات‬ ‫به‬ ‫وابسته‬ ‫باید‬ ‫جزئیات‬ ‫بلکه‬ ،‫باشند‬ ‫جزئیات‬ ‫به‬ ‫وابسته‬ ‫نباید‬ ‫انتزاعات‬‫ند‬.

17. <?php
Interface dbInterface
{
public function insert($data);
}
Interface mailerInreface
{
public function send();
}
class example
{
protected $db;
protected $mailer;
public function __construct(dbInterface $db, mailerInreface $mailer)
{
$this->db = $db;
$this->mailer = $mailer;
}
public function create()
{
$id = $this->db->insert(/* $data */);
$this->mailer->send();
//…
return $id;
}
}

18. Dependency injection container
‫نگهداری‬ِ‫منطق‬ِ‫ایجاد‬‫ساخت‬ ‫اصلی‬ ‫ایده‬ ،‫نقطه‬ ‫یک‬ ‫در‬ ‫ها‬ ‫آبجکت‬dependency injection container-
‫باشد‬ ‫می‬ ‫ها‬.

19. container-‫به‬ ‫کانفیگ‬ ‫نوع‬ ‫اساس‬ ‫بر‬ ‫ها‬4‫شود‬ ‫می‬ ‫تقسیم‬ ‫دسته‬:
.1Pure php:pimple
.2XML‫و‬YAML:symfony
.3Annotation Base:Disco
.4Auto-wiring:symfony PHP-DI Illuminate

20. <?php
Interface dbInterface{public function insert($data);}
Interface mailerInreface{public function send();}
class db implements dbInterface
{
public function insert($data){/* TODO */}
}
class mailer implements mailerInreface
{
public function send(){ mail(); }
}
class example
{
protected $db;
protected $mailer;
public function __construct($container)
{
$this->db = $container['db'];
$this->mailer = $container['mailer'];
}
public function create()
{
$id = $this->db->insert(/* $data */);
$this->mailer->send();
//…
return $id;
}
}
$container['db'] = new db;
$container['mailer'] = new mailer;
$example = new example($container);

21. <?php
Interface dbInterface{public function insert($data);}
Interface mailerInreface{public function send();}
class db implements dbInterface
{
public function insert($data){/* TODO */}
}
class mailer implements mailerInreface
{
public function send(){ mail(); }
}
class example
{
protected $db;
protected $mailer;
public function __construct($container)
{
$this->db = $container['db'];
$this->mailer = $container['mailer'];
}
public function create()
{
$id = $this->db->insert(/* $data */);
$this->mailer->send();
//…
return $id;
}
}
$container['db'] = new db;
$container['mailer'] = new mailer;
$example = new example($container);
Service Locator

22. <?php
interface MyServiceLocator
{
public function get($id);
public function has($id);
}
interface MyDependencyContianer
{
public function get($id);
public function has($id);
}

23. <?php
interface MyServiceLocator
{
public function get($id);
public function has($id);
}
interface MyDependencyContianer
{
public function get($id);
public function has($id);
}
Push vs Pull

24. https://leanpub.com/mlaphp
At no point will we be passing the container into any of the
objects that need dependencies. To do so would be using a
pattern called Service Locator.
‫ما‬ ‫اگر‬container‫واقع‬ ‫در‬ ‫کنیم‬ ‫ارسال‬ ‫دارد‬ ‫نیاز‬ ‫ها‬ ‫وابستگی‬ ‫به‬ ‫که‬ ‫آبجکتی‬ ‫به‬ ‫را‬‫از‬(‫ضد‬)‫الگویی‬
‫نام‬ ‫با‬service locator‫کردیم‬ ‫استفاده‬.

25. <?php
Interface dbInterface{public function insert($data);}
Interface mailerInreface{public function send();}
class db implements dbInterface
{
public function insert($data){/* TODO */}
}
class mailer implements mailerInreface
{
public function send(){ mail(); }
}
class example
{
protected $db;
protected $mailer;
public function __construct($container)
{
$this->db = $container['db'];
if(!$this->db instanceof dbInterface){
throw new Exception('some error');
}
$this->mailer = $container['mailer'];
}
public function create()
{
$id = $this->db->insert(/* $data */);
$this->mailer->send();
//…
return $id;
}
}
$container['db'] = new db;
$container['mailer'] = new mailer;
$example = new example($container);

26. instanceof
<?php
interface interface1{}
interface interface2{}
abstract class abstractClass{}
class myClass extends abstractClass implements interface1,interface2{}
class_alias('myClass','anotherClass');
$var=new anotherclass;
var_dump($var instanceof interface1); //true
var_dump($var instanceof interface2); //true
var_dump($var instanceof abstractClass); //true
var_dump($var instanceof myClass); //true
var_dump($var instanceof anotherClass); //true

27. Inversion of control:‫آن‬ ‫به‬ ‫آبجکت‬ ‫یک‬ ‫های‬ ‫وابستگی‬ ‫وقتی‬‫شود‬ ‫داده‬‫وابست‬ ‫ساختن‬ ‫مسئول‬ ‫آبجکت‬ ‫آن‬ ‫و‬‫گی‬
‫خود‬ ‫های‬‫نباشد‬(.design principle)
Dependency injection:‫اصل‬ ‫سازی‬ ‫پیاده‬ ‫برای‬ ‫هایی‬ ‫تکنیکی‬IoC
.1Constructor injection
.2Property injection
.3Setter injection
.4Interface injection
Dependency inversion Principle:‫انتزاعات‬ ‫بر‬ ‫تکیه‬ ‫برای‬ ‫اصلی‬(abstract , interface)
Dependency injection Container:‫باال‬ ‫موارد‬ ‫سازی‬ ‫پیاده‬ ‫برای‬ ‫ابزاری‬.
Service Locator:‫ارسال‬container‫کند‬ ‫می‬ ‫استفاده‬ ‫ها‬ ‫وابستگی‬ ‫آن‬ ‫از‬ ‫که‬ ‫کالسی‬ ‫به‬.

28. PSR-11: Container Interface
<?php
namespace PsrContainer;
interface ContainerInterface
{
public function get($id);
public function has($id);
}
/**
* Base interface representing a generic exception in a container.
*/
interface ContainerExceptionInterface
{
}
/**
* No entry was found in the container.
*/
interface NotFoundExceptionInterface extends ContainerExceptionInterface
{
}

29. Auto-wiring and Reflection
‫ساختن‬(create)‫توسط‬ ‫ها‬ ‫وابستگی‬ ‫تزریق‬ ‫و‬container‫اتوماتیک‬ ‫صورت‬ ‫به‬.
<?php
class example
{
public function __construct(db $db, mailer $mailer)
{}
}
class mailer{}
class db{}
$reflector = new ReflectionClass('example');
$parameters = $reflector->getMethod('__construct')->getParameters();
foreach ($parameters as $param) {
echo $param->getClass()->name . "n";
}
db
mailer

30. ‫عربی‬ ‫میالد‬
milad.arabi@gmail.com
https://twitter.com/ooghry
https://www.linkedin.com/in/miladarabi/
‫متشکرم‬
‫از‬new class‫و‬Dependency injection
‫تا‬PSR-11‫و‬Auto-wiring