6. 类中魔术方法的使用

<?
/**
 * @description 类中魔术方法的定义
 * @package null
 * @version 1.0.0
 */
class Test {
 private $name;
 private $age;

 public function __construct($name = null, $age = null) {
  $this->name = $name;
  $this->age = $age;
 }

 /**
  * 判断属性在该类中是否存在
  * @param string $propertyName 属性名称
  */
 private function isPropertyExists($propertyName) {
  $properties = get_class_vars(get_class($this));
  if (!array_key_exists($propertyName, $properties)) {
   echo '属性值' . $propertyName . '不存在';
   exit();
  }
 }

 public function __set($propertyName, $propertyValue) {
  $this->isPropertyExists($propertyName);
  $this->$propertyName = $propertyValue;
 }

 public function __get($propertyName) {
  $this->isPropertyExists($propertyName);
  return $this->$propertyName;
 }

 public function __toString() {
  return $this->name . PHP_EOL . $this->age;
 }


}