关于类的反射
关于类的反射
类的反射:通过实例化后的对象,获得所属的类、这个类有哪些属性、方法等信息。
反射API:
class User{ public $name; private $age; static $gender; public function __construct($name='',$age=0,$gender='保密'){ $this->name = $name; $this->age = $age; self::$gender = $gender;//注意,这里self::后的变量要写$符号 } public function getInfo(){ return '姓名:'.$this->name.',年龄:'.$this->age; } } $student = new User('zhang_san',12); $reflect = new ReflectionObject($student); var_dump($reflect); //输出: //object(ReflectionObject)[2] // public 'name' => string 'User' (length=4) //获取$student这个对象所属的类 var_dump(get_class($student)); //输出:string 'User' //获取所属的【类的属性】列表 $props = $reflect->getProperties(); foreach ($props as $value) { //打印访问权限 echo $value->isStatic()?'static ':''; echo $value->isPublic()?'public':''; echo $value->isPrivate()?'private':''; echo $value->isProtected()?'protected':''; //打印属性名字 echo ' ' . $value->getName(); echo '<br>'; } //输出结果: // public name // private age // static public gender //获取所属的【类的方法】列表 $methods= $reflect->getMethods(); foreach ($methods as $value) { //打印访问权限 echo $value->isStatic()?'static ':''; echo $value->isPublic()?'public':''; echo $value->isPrivate()?'private':''; echo $value->isProtected()?'protected':''; echo $value->isAbstract()?'abstract':''; //打印属性名字 echo ' ' . $value->getName(); echo '<br>'; } //输出结果: //public __construct //public getInfo
扩展知识:(关于class的函数)
var_dump(get_class($student)); //输出:string 'User' var_dump(get_object_vars($student)); // array (size=1) // 'name' => string 'zhang_san' var_dump(get_class_vars(get_class($student))); // array (size=2) // 'name' => null // 'gender' => string '保密' var_dump(get_class_methods(get_class($student))); // array (size=2) // 0 => string '__construct' // 1 => string 'getInfo'