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1205课程,单例类,工厂模式,依赖注入,面向接口编程
张浩刚
Original
836 people have browsed it

单例类

  1. <?php
  2. namespace _1205;
  3. use PDO;
  4. class demo{
  5. }
  6. $obj1 = new demo();
  7. $obj2 = new demo();
  8. var_dump($obj1 == $obj2); //true
  9. echo '<hr>';
  10. var_dump($obj1 === $obj2); //false
  11. echo '<hr>';
  12. //单例模式
  13. //当构造方法被私有化后,它本身就只能在内部实例化(new 类名),故它就是单例模式
  14. class Demo1{
  15. protected function __construct()
  16. {
  17. }
  18. protected static $instance;
  19. public static function getout(){
  20. is_null(static::$instance) ? static::$instance=new self() : '';
  21. //也可以用下面的方法
  22. // if(is_null(static::$instance)){
  23. // static::$instance=new self();
  24. // }
  25. return static::$instance;
  26. }
  27. }
  28. $obj1 = Demo1::getout();
  29. $obj2 = Demo1::getout();
  30. var_dump($obj1 === $obj2);
  31. echo '<br>';
  32. var_dump($obj1, $obj2);
  33. echo '<hr>';
  34. //单例模式应用场景 连接数据库
  35. class Db{
  36. private static $pdo = null;
  37. public static function getDate(...$connectParam){
  38. //这里类实例化new self(...$connectParam), 就是为了把它传参给构造方法
  39. //is_null是为了验证第一行的$pdo是否被实例化,没有就实例化并传参给构造方法
  40. is_null(static::$pdo) ? new self(...$connectParam) : '';
  41. return static::$pdo;
  42. }
  43. protected function __construct(...$connectParam){
  44. $dsn = $connectParam[0];
  45. $user = $connectParam[1];
  46. $password = $connectParam[2];
  47. static::$pdo = new PDO($dsn,$user,$password);
  48. }
  49. //禁止使用克隆魔术
  50. public function __clone()
  51. {
  52. }
  53. }
  54. $connectParam = ['mysql:host=localhost;dbname=film', 'root', 'root'];
  55. $pdo = Db::getDate(...$connectParam);
  56. print_r($pdo);
  57. //查询数据库内容,也可以用query()
  58. print_r($pdo->query('SELECT * FROM `movies`')->fetchAll(PDO::FETCH_ASSOC));

工厂模式

  1. <?php
  2. namespace _1205;
  3. class demo2{
  4. //...
  5. }
  6. // file1.php
  7. $obj = new Demo2();
  8. // file2.php
  9. $obj = new Demo2();
  10. // file3.php
  11. $obj = new Demo2();
  12. //这样调用每次都要实例化一次,很麻烦,故采用工厂模式比较方便
  13. //工厂模式 implode() 将数组转换成字符串
  14. class text1{
  15. public function __construct($arg1)
  16. {
  17. echo '对象1=' . $arg1;
  18. }
  19. }
  20. class text2{
  21. public function __construct($arg1, $arg2)
  22. {
  23. echo '对象2=' . implode(', ', [$arg1, $arg2]);
  24. }
  25. }
  26. class text3{
  27. public function __construct($arg1, $arg2, $arg3)
  28. {
  29. echo '对象3=' . implode(', ', [$arg1, $arg2, $arg3]);
  30. }
  31. }
  32. //使用工厂模式,专门创建类实例/对象
  33. class Factory{
  34. public static function create($classname, ...$argments){
  35. return new $classname(...$argments);
  36. }
  37. }
  38. // 类名::class 完整的类名,命名空间
  39. Factory::create(text1::class, 100);
  40. echo '<br>';
  41. Factory::create(text2::class, 100,200);
  42. echo '<br>';
  43. Factory::create(text3::class, 100,200,300);

依赖注入

  1. <?php
  2. // 依赖注入:解决对象
  3. // 工作类
  4. class Person{
  5. //要依赖的外部对象
  6. private $car = null;
  7. public function __construct()
  8. {
  9. //在构造方法中将外部对象全部实例化
  10. //注入点在构造方法中
  11. $this->car = new Car();
  12. }
  13. public function work(){
  14. return $this->car->drive();
  15. }
  16. }
  17. // 依赖的外部类
  18. class car{
  19. public function drive(){
  20. return '开车上班';
  21. }
  22. }
  23. // 客服端实例化
  24. $person = new Person();
  25. echo $person->work();
  26. echo '<hr>';
  27. /*******************************************/
  28. // 最傻瓜的依赖输入方式二
  29. class Person1{
  30. private static $car = null;
  31. public function __construct(Car1 $car1)
  32. {
  33. static::$car = $car1;
  34. }
  35. public function work(){
  36. return static::$car->drive();
  37. }
  38. }
  39. class Car1{
  40. public function drive(){
  41. return '开皮卡去上班';
  42. }
  43. }
  44. $car1 = new Car1();
  45. $person1 = new Person1($car1);
  46. echo $person1->work();

自动连接 autoload.php

  1. <?php
  2. spl_autoload_register(function ($className){
  3. $path = str_replace('\\', '/', $className);
  4. require dirname(__DIR__) . DIRECTORY_SEPARATOR . $path . '.php';
  5. });

工厂模式小案例

  1. <?php
  2. namespace demo;
  3. use demo\Vehicle\car;
  4. use demo\Vehicle\bus;
  5. use demo\Vehicle\ship;
  6. require __DIR__ . '/autoload.php';
  7. // 工厂类, 专用于创建类实例
  8. class Factroy{
  9. protected static $intance = null;
  10. public static function getDrive($variable){
  11. switch ($variable) {
  12. case 'car':
  13. static::$intance = new car();
  14. break;
  15. case 'bus':
  16. static::$intance = new bus();
  17. break;
  18. case 'ship':
  19. static::$intance = new ship();
  20. break;
  21. }
  22. // 返回当前具体的交通工具
  23. return static::$intance;
  24. }
  25. }
  26. class drive{
  27. // 交通工具
  28. protected static $vehicle;
  29. // 构造方法 调用工厂,传参
  30. public function __construct($variable)
  31. {
  32. static::$vehicle = Factroy::getDrive($variable);
  33. }
  34. // 调用外部一个依赖对象
  35. public function trave(){
  36. return static::$vehicle->drive() . ' 美好生活';
  37. }
  38. }
  39. //客户端输出
  40. echo (new drive('ship'))->trave() . '<br>';
  41. echo (new drive('car'))->trave() . '<br>';
  42. echo (new drive('bus'))->trave() . '<br>';
  43. //#外部类################
  44. //#外部类################
  45. //#外部类################
  46. <?php
  47. namespace demo\Vehicle;
  48. class bus{
  49. public function drive(){
  50. return '坐公交车';
  51. }
  52. }
  53. ===============================
  54. <?php
  55. namespace demo\Vehicle;
  56. class car{
  57. public function drive(){
  58. return '开汽车';
  59. }
  60. }
  61. ===============================
  62. <?php
  63. namespace demo\Vehicle;
  64. class ship{
  65. public function drive(){
  66. return '坐轮船';
  67. }
  68. }

接口类 代替 工厂模式

  1. <?php
  2. namespace demo;
  3. use demo\Vehicle\train;
  4. use demo\Vehicle\plane;
  5. use demo\Vehicle\iVehicle;
  6. require __DIR__ . '/autoload.php';
  7. class travee{
  8. // 交通工具
  9. private static $vehicle;
  10. // 构造方法
  11. public function __construct(iVehicle $vehicle)
  12. {
  13. static::$vehicle = $vehicle;
  14. }
  15. // 调用外部一个依赖对象
  16. public function go()
  17. {
  18. return static::$vehicle->drive() . ' : ======= 去旅行';
  19. }
  20. }
  21. //客户端调用
  22. echo (new travee(new plane()))->go(),'<br>';
  23. echo (new travee(new train()))->go();
  24. //#####################
  25. //#####################
  26. //#####################
  27. <?php
  28. namespace demo\Vehicle;
  29. //接口
  30. interface iVehicle{
  31. public function drive();
  32. }
  33. ===========================
  34. <?php
  35. namespace demo\Vehicle;
  36. class plane implements iVehicle{
  37. public function drive(){
  38. return '坐飞机';
  39. }
  40. }
  41. ===========================
  42. <?php
  43. namespace demo\Vehicle;
  44. class train implements iVehicle{
  45. public function drive(){
  46. return '坐火车';
  47. }
  48. }

总结

本节课相对简单,今天好好做了一次,基本掌握了

Correcting teacher:天蓬老师天蓬老师

Correction status:qualified

Teacher's comments:掌握了就好, 我比你还高兴
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