php 继承_PHP教程

php 继承

name=$name;
            $this->age=$age;
            $this->sex=$sex;
            $this->school = $school;
        }
         
        function study(){
            echo $this->age;
            echo $this->name.":我在{$this->school}学习
";
        }
         
        /*
            覆盖父类的say(),子类中重载的方法，不能低于父类中的访问权限（子类可以放大权限，但不能缩小权限）
            父类中是public function say(){}
            子类中变成了private function say(){}
            private function say(){
                echo "{$this->name}:我在{$this->school}学习呢，请不要打扰我
";
            }
            这时候会报错Fatal error: Access level to Student::say() must be public (as in class Person
        */
         
        public function say(){
            parent::say();
            echo "{$this->name}:我在{$this->school}学习呢，请不要打扰我
";
        }
    }
     
    #$student = new Student;
    #$student->school="北京大学附属中学";
    #$student->name="haha";
    #$student->age=32;
    #$student->study();
    #$student->say();
     
    $student2 = new Student("李会东",24,"男","北京大学");
    #echo $student2->school;
    $student2->say();
?>

http://www.bkjia.com/PHPjc/1061541.htmlwww.bkjia.comtruehttp://www.bkjia.com/PHPjc/1061541.htmlTechArticlephp 继承 ?php/*继承性 1.面向对象的三大特性之一 2.开放性,可扩充性 3.增加代码的重用性 4.提高了软件的可维护性 php 使弱类型语言，没有重...