Home>Article>Backend Development> Reflection instance analysis of PHP advanced features
反射是指PHP在运行状态中，动态的获取类、方法、属性、参数、注释等信息和动态调用对象的方法的功能。PHP5 开始提供了完整的反射API。有反射类（ReflectionClass）和反射函数（ReflectionFunction）等，功能大同小异，这里主要以ReflectionClass为列说明。
有什么用
可以帮助我们构建复杂的，可扩的运用。比如自动加载插件，自动生成文档等
代码示例
该示例为一个通用API入口
HttpApi.php
namespace twinkle\service\http; class HttpApi { private $class; public function __construct($class) { $this->class = $class; } public function parseRequest($method,$params = []) { $class = new \ReflectionClass($this->class); $instance = $class->newInstanceArgs($params); $method = $class->getMethod($method); $args = []; foreach ($method->getParameters() as $param) { $name = $param->getName(); if (isset($params[$name])) { $args[$name] = $params[$name]; } else { try { $args[$name] = $param->getDefaultValue(); } catch (\Exception $e) { throw new RequestException( '请求参数不合未能', 500 ); } } } return [$instance,$method,$args]; } }
NotFoundService.php
namespace app\services; use app\base\Service; class NotFoundService extends Service { public function error() { return $this->format(['status' => 1, 'msg' => '请求不合法,请确认service和method是否存在']); } }
使用范例
$params = $_REQUEST; $serviceName= isset($params['service']) ? $params['service'] : 'NotFound'; $methodName= isset($params['method']) ? $params['method'] : 'error'; $class = '\\app\\services\\' . Str::ucWords($serviceName) . 'Service'; list($instance, $method, $args) = (new HttpApi($class))->parseRequest($methodName, $params); echo json_encode(($method->invokeArgs($instance, $args)));
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