详解php中反射的应用_PHP
反射是在PHP运行状态中,扩展分析PHP程序,导出或提取出关于类、方法、属性、参数等的详细信息,包括注释。这种动态获取的信息以及动态调用对象的方法的功能称为反射API。反射是操纵面向对象范型中元模型的API,其功能十分强大,可帮助我们构建复杂,可扩展的应用。
其用途如:自动加载插件,自动生成文档,甚至可用来扩充PHP语言。
php反射api由若干类组成,可帮助我们用来访问程序的元数据或者同相关的注释交互。借助反射我们可以获取诸如类实现了那些方法,创建一个类的实例(不同于用new创建),调用一个方法(也不同于常规调用),传递参数,动态调用类的静态方法。
反射api是php内建的oop技术扩展,包括一些类,异常和接口,综合使用他们可用来帮助我们分析其它类,接口,方法,属性,方法和扩展。这些oop扩展被称为反射。
通过ReflectionClass,我们可以得到Person类的以下信息:
1)常量 Contants
2)属性 Property Names
3)方法 Method Names静态
4)属性 Static Properties
5)命名空间 Namespace
6)Person类是否为final或者abstract
然后就去看了看thinkphp的源码,对于MVC的实现也有不同的体验 ThinkPHP\Lib\Core\App.class.php 中的exec方法
if(!preg_match('/^[A-Za-z](\w)*$/',$action)){ // 非法操作 throw new ReflectionException(); } //执行当前操作 $method = new ReflectionMethod($module, $action); #查看方法 if($method->isPublic()) { $class = new ReflectionClass($module); #反射控制器 // 前置操作 if($class->hasMethod('_before_'.$action)) { $before = $class->getMethod('_before_'.$action); if($before->isPublic()) { $before->invoke($module); } } // URL参数绑定检测 if(C('URL_PARAMS_BIND') && $method->getNumberOfParameters()>0){ switch($_SERVER['REQUEST_METHOD']) { case 'POST': $vars = $_POST; break; case 'PUT': parse_str(file_get_contents('php://input'), $vars); break; default: $vars = $_GET; } $params = $method->getParameters(); foreach ($params as $param){ $name = $param->getName(); if(isset($vars[$name])) { $args[] = $vars[$name]; }elseif($param->isDefaultValueAvailable()){ $args[] = $param->getDefaultValue(); }else{ throw_exception(L('_PARAM_ERROR_').':'.$name); } } $method->invokeArgs($module,$args); }else{ $method->invoke($module); #执行我们需要调用函数 } // 后置操作 if($class->hasMethod('_after_'.$action)) { $after = $class->getMethod('_after_'.$action); if($after->isPublic()) { $after->invoke($module); } }
以上就是关于php中反射的应用,希望对大家理解学习php反射有所帮助。

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