\u793a\u4f8b\u4ee3\u7801<\/p>\n
\r\nclass A {}\r\nclass B {}\r\nclass C {\r\n \/**\r\n * C constructor.\r\n * @param A $objA\r\n * @param B $objB\r\n *\/\r\n public function __construct(A $objA, B $objB) {\r\n $this->a = $objA;\r\n $this->b = $objB;\r\n }\r\n}\r\n\r\nfunction getConcrete($name, $params){\r\n $reflector = new ReflectionClass($name);\r\n $constructor = $reflector->getConstructor();\r\n $dependencies = $constructor->getParameters();\r\n var_dump($params);\r\n var_dump($dependencies);\r\n\r\n foreach ($params as $key => $value) {\r\n if (is_numeric($key)) {\r\n unset($params[$key]);\r\n $params[$dependencies[$key]->name] = $value;\r\n }\r\n }\r\n var_dump($params);\r\n\r\n $args = [];\r\n foreach ($dependencies as $parameter) {\r\n $dependency = $parameter->getClass();\r\n $args[] = $params[$parameter->name];\r\n }\r\n\r\n $c = $reflector->newInstanceArgs($args);\r\n var_dump($c);\r\n\r\n return $c;\r\n}\r\n\r\ngetConcrete('C', [\r\n 'objB' => new B,\r\n new A,\r\n]);\r\n<\/pre>\ndi\u5bb9\u5668\u7684\u5e94\u7528<\/p>\n
public function build($concrete, array $parameters = [])\r\n $reflector = new ReflectionClass($concrete);\r\n $this->buildStack[] = $concrete;\r\n\r\n $constructor = $reflector->getConstructor();\r\n\r\n \/\/ If there are no constructors, that means there are no dependencies then\r\n \/\/ we can just resolve the instances of the objects right away, without\r\n \/\/ resolving any other types or dependencies out of these containers.\r\n if (is_null($constructor)) {\r\n array_pop($this->buildStack);\r\n\r\n return new $concrete;\r\n }\r\n\r\n $dependencies = $constructor->getParameters();\r\n\r\n \/\/ Once we have all the constructor's parameters we can create each of the\r\n \/\/ dependency instances and then use the reflection instances to make a\r\n \/\/ new instance of this class, injecting the created dependencies in.\r\n $parameters = $this->keyParametersByArgument(\r\n $dependencies, $parameters\r\n );\r\n\r\n $instances = $this->getDependencies(\r\n $dependencies, $parameters\r\n );\r\n\r\n array_pop($this->buildStack);\r\n\r\n return $reflector->newInstanceArgs($instances);\r\n }\r\n\r\n protected function keyParametersByArgument(array $dependencies, array $parameters)\r\n {\r\n foreach ($parameters as $key => $value) {\r\n if (is_numeric($key)) {\r\n unset($parameters[$key]);\r\n\r\n $parameters[$dependencies[$key]->name] = $value;\r\n }\r\n }\r\n\r\n return $parameters;\r\n }\r\n\r\n protected function getDependencies(array $parameters, array $primitives = [])\r\n {\r\n $dependencies = [];\r\n\r\n foreach ($parameters as $parameter) {\r\n $dependency = $parameter->getClass();\r\n\r\n \/\/ If the class is null, it means the dependency is a string or some other\r\n \/\/ primitive type which we can not resolve since it is not a class and\r\n \/\/ we will just bomb out with an error since we have no-where to go.\r\n if (array_key_exists($parameter->name, $primitives)) {\r\n $dependencies[] = $primitives[$parameter->name];\r\n } elseif (is_null($dependency)) {\r\n $dependencies[] = $this->resolveNonClass($parameter);\r\n } else {\r\n $dependencies[] = $this->resolveClass($parameter);\r\n }\r\n }\r\n\r\n return $dependencies;\r\n }\r\n\r\n protected function resolveClass(ReflectionParameter $parameter)\r\n {\r\n try {\r\n return $this->make($parameter->getClass()->name);\r\n }\r\n\r\n \/\/ If we can not resolve the class instance, we will check to see if the value\r\n \/\/ is optional, and if it is we will return the optional parameter value as\r\n \/\/ the value of the dependency, similarly to how we do this with scalars.\r\n catch (BindingResolutionException $e) {\r\n if ($parameter->isOptional()) {\r\n return $parameter->getDefaultValue();\r\n }\r\n\r\n throw $e;\r\n }\r\n }\r\n\r\n<\/pre>\n","protected":false},"excerpt":{"rendered":"\u793a\u4f8b\u4ee3\u7801 class A {} class B {} class C { \/** * C constructo […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6],"tags":[],"_links":{"self":[{"href":"https:\/\/blog.inforere.com\/index.php?rest_route=\/wp\/v2\/posts\/234"}],"collection":[{"href":"https:\/\/blog.inforere.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blog.inforere.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blog.inforere.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/blog.inforere.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=234"}],"version-history":[{"count":7,"href":"https:\/\/blog.inforere.com\/index.php?rest_route=\/wp\/v2\/posts\/234\/revisions"}],"predecessor-version":[{"id":241,"href":"https:\/\/blog.inforere.com\/index.php?rest_route=\/wp\/v2\/posts\/234\/revisions\/241"}],"wp:attachment":[{"href":"https:\/\/blog.inforere.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=234"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.inforere.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=234"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.inforere.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=234"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}