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PHP类和对象的基础学习——php线上第九期
木易
Original
721 people have browsed it

1. 创建类、实例化、命名空间、类成员、类方法(手写)



  1. <?php
  2. //定义类
  3. class people{
  4. }
  5. //实例化类
  6. $o1 =new people();
  7. //数据类型object
  8. var_dump($o1);
  9. echo'<hr>';
  10. //判断是否属于同个类的实例
  11. var_dump($o1 instanceof people);
  12. $o2 =new people();
  13. echo '<hr>';
  14. //两个对象虽然同属于一个类的实例,但是彼此不全相等
  15. var_dump($o1==$o2);
  16. echo '<hr>';
  17. var_dump($o1 === $o2);
  18. echo '<hr>';
  1. <?php
  2. //命名空间:解决全局成员的命名冲突问题
  3. //namespace red;
  4. //class Test{
  5. //
  6. //}
  7. //namespace blue;
  8. //class Test{
  9. //
  10. //}
  11. //也可以使用大括号来声明
  12. // namespace one{
  13. // class Test{}
  14. // }
  15. $name ='网络摄像机';
  16. class A{
  17. public $name='网络摄像机';
  18. public $price ='700';
  19. }
  20. $a =new A();
  21. // 访问类的成员:->,访问成员和方法
  22. echo $a -> price;
  23. //动态对象属性
  24. $a -> brand = '华为';
  25. echo $a -> brand;
  26. //对象方法
  27. class B{
  28. public $name ='人类';
  29. public $color = '黄色';
  30. public function chifan(){
  31. echo $this ->name.'去吃饭';
  32. }
  33. public function heshui(){
  34. echo '欧文要喝水';
  35. }
  36. public function newlei(){
  37. $b =new self();
  38. echo $b -> chifan();
  39. }
  40. }
  41. //类外实例化
  42. $ren = new B();
  43. print_r(get_class_methods(B::class));
  44. $ren -> chifan();
  45. echo '<hr>';

2. 构造方法

  1. //构造方法:初始化对象成员,_construct()
  2. class C{
  3. public $name;
  4. public $age;
  5. public function __construct($name,$age){
  6. $this ->name = $name;
  7. $this -> age = $age;
  8. echo $this -> name .$this ->age;
  9. }
  10. // 析构方法:在对象被删除时清理时自动调用
  11. public function __destruct(){
  12. echo '对象删除';
  13. }
  14. }
  15. //当类实例化就会立即执行构造方法
  16. $a = new C('木易','21');
  17. echo '<hr>';
  18. $a = new C('欧阳','18');
Correcting teacher:天蓬老师天蓬老师

Correction status:qualified

Teacher's comments:完成的比较简单
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