php面向对象（OOP 编程）- 类访问修饰符

后端开发|php教程

php面向对象（OOP 编程）- 类访问修饰符

后端开发-php教程

类型的访问修饰符允许开发人员对类成员的访问进行限制，这是PHP5的新特性

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public;echo $this->protected;echo $this->private;}}$obj = new MyClass();echo $obj->public;// Worksecho $obj->protected;// Fatal Errorecho $obj->private;// Fatal Error$obj->printHello();// Shows Public, Protected and Private/** * Define MyClass2 */class MyClass2 extends MyClass{// We can redeclare the public and protected method, but not privateprotected $protected = Protected2;function printHello(){echo $this->public;echo $this->protected;echo $this->private;}}$obj2 = new MyClass2();echo $obj->public;// Worksecho $obj2->private;// Undefinedecho $obj2->protected;// Fatal Error$obj2->printHello();// Shows Public, Protected2, not Private?>

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MyPublic();$this->MyProtected();$this->MyPrivate();}}$myclass = new MyClass;$myclass->MyPublic();// Works$myclass->MyProtected();// Fatal Error$myclass->MyPrivate();// Fatal Error$myclass->Foo();// Public, Protected and Private work/** * Define MyClass2 */class MyClass2 extends MyClass{// This is publicfunction Foo2(){$this->MyPublic();$this->MyProtected();$this->MyPrivate();// Fatal Error}}$myclass2 = new MyClass2;$myclass2->MyPublic();// Works$myclass2->Foo2();// Public and Protected work, not Private?>