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:
<?php class 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:
张三 张三在说话 22 bool(false) unset------------>张三 goodbye2 goodbye3 goodbye张三
希望本文所述对大家PHP程序设计有所帮助。
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