A brief description of the php reflection mechanism and detailed examples

Abstract: This article mainly introduces the use of PHP reflection mechanism, which is an important concept in PHP programming. Friends who need it can refer to it

1. What is reflection
Reflection is an API for manipulating the meta-model in the object-oriented paradigm (php5)
Through ReflectionClass, we can get the following information of the Person class:
1) Constants Contents
2) Property Property Names
3) Method Names Static
4) Property Static Properties
5) Namespace Namespace
6) Whether the Person class is final or abstract

<? php
   classPerson {
    public $id;
    public $username;
    private $pwd;
    private $sex;
    public function run() {
        echo &#39;<br/>running';
    }
}
$class = new ReflectionClass('Person'); //建立反射类
$instance=$class->newInstance(); //实例化
print_r($instance); //Person Object ( [id] => [username] => [pwd:Person:private] => [sex:Person:private] => )$properties = $class->getProperties();foreach($properties as $property) {
echo "<br/>" . $property->getName();
} 
//默认情况下，ReflectionClass会获取到所有的属性，private 和 protected的也可以。如果只想获取到private属性，就要额外传个参数：
//$private_properties = $class->getProperties(ReflectionProperty::IS_PRIVATE);
//可用参数列表：
//               ReflectionProperty::IS_STATIC
//               ReflectionProperty::IS_PUBLIC
//               ReflectionProperty::IS_PROTECTED
//               ReflectionProperty::IS_PRIVATE
//     如果要同时获取public 和private 属性，就这样写：ReflectionProperty::IS_PUBLIC | ReflectionProperty::IS_PROTECTED。
//   通过$property->getName()可以得到属性名。$class->getMethods();
//获取方法(methods)：通过getMethods() 来获取到类的所有methods。$instance->run();
 //执行Person 里的方法getBiography
 //或者：$ec=$class->getmethod('run');  
 //获取Person 类中的getName方法$ec->invoke($instance);

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