4-5-2.php

php电子书

4-5-2.php<br>
//类型提示.<br>
<?
class NormalUser{
	/*
	* 其它相关代码..省略........
	*/
	private $age;
	public function setAge($_age){
		if(is_numeric($_age)){
			$this->age = $_age;
		}		
	}	
	public function getAge(){
		return $this->age ;
	}
}

$normalUser = new NormalUser();
$normalUser->setAge("I am tom"); //这里我们传输一个非数值.
echo "age is " .$normalUser->getAge();//看到这里的结果为空.
echo  "<br>";
$normalUser->setAge("100");
echo "age is ".$normalUser->getAge();// 这里就有了结果.



?>