PHP_magic_method.md

2014/7/20 #PHP 魔术方法

###OOP 中的魔术方法 ####__set():

在为私有属性赋值时自动调用 声明: void __set(string name, mixed value)

class Person {
	private $name;
	private $sex;
	private $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;
	}
	
	public function say() {
		echo '姓名:'.$this->name.' 性别:'.$this->sex.' 年龄:'.$this->age.'<br />';
	}
}
$person = new Person('小明', '男', 35);
$person->say();
$person->name = '小樱';
$person->sex = '女';
$person->age = 20;
$person->say();

####__get()

声明:mixed __get(string name)

class Person {
	private $name;
	private $sex;
	private $age;
	
	function __construct($name, $sex, $age) {
		$this->name = $name;
		$this->sex = $sex;
		$this->age = $age;
	}
	
	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;
			}
	}
}
$person = new Person('小明', '男', 35);
echo '姓名:'.$person->name.' 性别:'.$person->sex.' 年龄:'.$person->age.'<br />';

####__isset():

判断是否存在该属性 声明:bool __isset(string name)

####__unset():

删除该属性 声明:void __unset(string name)