本文实例讲述了PHP面向对象程序设计类的定义与用法。分享给大家供大家参考，具体如下：
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<?phpclass Person { private $name; private $sex; private $age; function __construct($name = "", $sex = "男", $age = 22) { $this->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 < 0) { return; } } // 根据传入的成员属性名,赋上相应的值 $this->$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->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;?> |
结果：
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张三张三在说话22bool(false)unset------------>张三goodbye2goodbye3goodbye张三 |
希望本文所述对大家PHP程序设计有所帮助。
