OOP_extends.md

2014/7/20 #OOP 继承性

//继承
class Person {
	protected $name;
	protected $sex;
	protected $age;
	
	function __construct($name, $sex, $age) {
		$this->name = $name;
		$this->sex = $sex;
		$this->age = $age;
	}
	
	function __set($propertyName, $propertyValue) {
		if($propertyName == "sex") {
			if(!($propertyValue == "男" || $propertyValue == "女")) {
				return;
			}
		}
		
		if($propertyName == "age") {
			if($propertyValue >150 || $propertyValue < 0) {
				return;
			}
		}
		
		$this->$propertyName = $propertyValue;
	}
	
	function __get($propertyName) {
		if($propertyName == 'sex') {
			return '保密';
		}	else if($propertyName == 'age') {
				if($this->age > 30) {
					return $this->age - 5;
				}
				else {
					return $this->age;
				}
			}
			else {
				return $this->$propertyName;
			}
	}
	
	public function say() {
		echo '姓名:'.$this->name.' 性别:'.$this->sex.' 年龄:'.$this->age.'<br />';
	}
}
    
//Student 继承 Person
class Student extends Person {
	private $school;
	
	//重载构造函数
	function __construct($name, $sex, $age, $school){
		parent::__construct($name, $sex, $age);
		$this->school = $school;
	}
	
	//重载 say 函数
	function say(){
		parent::say();
		echo ' 学校:'.$this->school.'<br />';
	}
}
$person = new Person('小明', '男', 35);
$person->say();
$student = new Student('小樱', '女', 20, 'HDU');
$student->say();