PHP面向对象程序设计类的定义与用法简单示例

 name = $name; $this->sex = $sex; $this->age = $age; } // 直接为私有属性赋值时自动调用，可以屏蔽一些非法赋值 // 之前有版本可以设置方法为private function __set() // The magic method __set() must have public visibility // 因为5.35对魔术方法限制的严格了 public function __set($propertyName, $propertyValue) { if ($propertyName == "sex") { if (! ($propertyValue == "男" || $propertyValue == "女")) { return; } if ($propertyValue > 150 || $propertyValue $propertyName = $propertyValue; } // 用来获取私有属性 public function __get($propertyName) { if (isset ( $this->$propertyName )) { return ($this->$propertyName); } else { return (NULL); } } public function __isset($propertyName) { if ($propertyName == "name") { return false; // 返回假，不允许在对象外部测定这个属性 } return isset ( $this->$propertyName ); } public function __unset($propertyName) { if($propertyName=="name") { return; //不允许删除name属性 } unset($this->$propertyName); } function say() { echo $this->name . "在说话<br />"; } function run() { echo "在走路・<br />"; } function __destruct() { echo "goodbye" . $this->name . "<br />"; } } $person1 = new Person (); $person2 = new Person ( "2" ); $person3 = new Person ( "3" ); // 自动调用了__set() $person1->name = "张三"; echo $person1-<strong style="color:transparent">来源gaodai#ma#com搞@@代~&码网</strong>>name; echo "<br />"; echo $person1->say (); // 自动调用了__get() echo $person1->age; echo "<br />"; var_dump ( isset ( $person1->name ) ); echo "<br />"; unset($person1->name); echo "unset------------>".$person1->name;//name 没有被unset() echo "<br />"; $person2 = null; ?> 

 张三 张三在说话 22 bool(false) unset------------>张三 goodbye2 goodbye3 goodbye张三