public:權限是最大的，可以內部調用，實例調用等。
protected: 受保護類型，用于本類和繼承類調用。
private: 私有類型，只有在本類中使用。

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<?php error_reporting(E_ALL);class test{public $public;private $private;protected $protected;static $instance;public function __construct(){$this->public = 'public <br>';$this->private = 'private <br>';$this->protected = 'protected <br>';}static function tank(){if (!isset(self::$instance[get_class()])){$c = get_class();self::$instance = new $c;}return self::$instance;} public function pub_function() {echo "you request public function<br>";echo $this->public;echo $this->private; //private,內部可以調用echo $this->protected; //protected,內部可以調用$this->pri_function(); //private方法，內部可以調用$this->pro_function(); //protected方法，內部可以調用 }protected function pro_function(){echo "you request protected function<br>";}private function pri_function(){echo "your request private function<br>";}}$test = test::tank();echo $test->public;echo $test->private; //Fatal error: Cannot access private property test::$privateecho $test->protected; //Fatal error: Cannot access protected property test::$protected$test->pub_function();$test->pro_function(); //Fatal error: Call to protected method test::pro_function() from context$test->pri_function(); //Fatal error: Call to private method test::pri_function() from context?>

從上面的例子中，我們可以看出，
public:??? 可以class內部調用，可以實例化調用。
private:?? 可以class內部調用，實例化調用報錯。
protected：? 可以class內部調用，實例化調用報錯。

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<?php class test{public $public;private $private;protected $protected;static $instance;public function __construct(){$this->public = 'public <br>';$this->private = 'private <br>';$this->protected = 'protected <br>';}protected function tank(){ //私有方法不能繼承，換成public,protectedif (!isset(self::$instance[get_class()])){$c = get_class();self::$instance = new $c;}return self::$instance;}public function pub_function() {echo "you request public function<br>";echo $this->public;}protected function pro_function(){echo "you request protected function<br>";echo $this->protected;}private function pri_function(){echo "you request private function<br>";echo $this->private;} }class test1 extends test{public function __construct(){parent::tank();parent::__construct();}public function tank(){echo $this->public;echo $this->private; //Notice: Undefined property: test1::$privateecho $this->protected;$this->pub_function();$this->pro_function();$this->pri_function(); //Fatal error: Call to private method test::pri_function() from context 'test1' }public function pro_extends_function(){echo "you request extends_protected function<br>";}public function pri_extends_function(){echo "you request extends_private function<br>";} } error_reporting(E_ALL);$test = new test1(); $test -> tank(); //子類和父類有相同名字的屬性和方法，實例化子類時，子類的中的屬性和方法會蓋掉父類的。 ?>

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public:??? test中的public可以被繼承。
private:?? test中的private不可以被繼承。
protected：test中的protected可以被繼承。
static：???test中的static可以被繼承。

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轉載于:https://www.cnblogs.com/phper12580/p/10509011.html

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