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第8篇:PHP面向对象入门

  • 2026-04-21 11:01:44
第8篇:PHP面向对象入门

PHP面向对象入门

面向对象编程(OOP)是现代软件开发的核心思想。前面我们学的都是过程式编程——一步步告诉计算机怎么做。面向对象则是把数据和操作数据的方法打包在一起,形成"对象"。这篇文章会带你入门PHP的面向对象编程。

一、类和对象基础

是模板,对象是根据模板创建的具体实例:

<?php// 定义一个学生类classStudent{// 类的属性(特征)public$name;       // 姓名public$age;        // 年龄public$major;      // 专业// 构造函数:创建对象时自动调用publicfunction__construct($name$age$major{$this->name = $name;      // $this 指向当前对象$this->age = $age;$this->major = $major;    }// 自我介绍方法publicfunctionintroduce({return"大家好,我叫{$this->name},今年{$this->age}岁,专业是{$this->major}。";    }// 生日方法:年龄加1publicfunctionbirthday({$this->age++;return"{$this->name},生日快乐!你现在{$this->age}岁了。";    }}// 创建对象(实例化)$student1 = newStudent("张三"20"计算机科学");$student2 = newStudent("李梅"19"软件工程");// 调用对象的方法echo$student1->introduce() . "\n";echo$student2->introduce() . "\n";echo$student1->birthday() . "\n";?>

代码讲解:

  • class关键字定义类,类名通常用大驼峰命名法
  • public表示属性或方法是公开的,可以从外部访问
  • $this是特殊变量,指向当前对象实例
  • __construct()是构造函数,创建对象时自动执行
  • ->用来访问对象的属性和方法

二、属性类型修饰符

<?phpclassUser{public$username;      // 公开:任何地方都能访问protected$email;      // 受保护:同类、子类能访问private$password;     // 私有:只有本类能访问publicfunction__construct($username$email$password{$this->username = $username;$this->email = $email;$this->password = $password;    }// 公开的方法来访问受保护/私有的属性publicfunctiongetEmail({return$this->email;    }publicfunctionsetPassword($newPassword{// 可以在方法中添加验证逻辑if (strlen($newPassword) >= 6) {$this->password = $newPassword;returntrue;        }returnfalse;    }}$user = newUser("zhangsan""zhangsan@example.com""pass123");echo"用户名:" . $user->username . "\n";        // 可以访问echo"邮箱:" . $user->getEmail() . "\n";       // 通过方法访问// 设置新密码if ($user->setPassword("newpass")) {echo"密码修改成功!\n";}?>

代码讲解:

  • public:公开属性,任何地方都能访问
  • protected:受保护属性,只能在本类和子类中访问
  • private:私有属性,只能在本类中访问
  • 为了保护数据,通常把属性设为private,然后提供公开的getter/setter方法

三、继承

继承让你可以在现有类的基础上创建新类:

<?php// 父类:动物classAnimal{protected$name;protected$age;publicfunction__construct($name$age{$this->name = $name;$this->age = $age;    }publicfunctionspeak({return"......";    }publicfunctioninfo({return"{$this->name}{$this->age}岁";    }}// 子类:狗classDogextendsAnimal{  // extends 关键字表示继承publicfunctionspeak({return"汪汪汪!";    }// 狗特有的方法publicfunctionfetch({return"{$this->name}去捡球了!";    }}// 子类:猫classCatextendsAnimal{publicfunctionspeak({return"喵喵喵~";    }publicfunctioncatchMouse({return"{$this->name}在抓老鼠!";    }}// 测试$dog = newDog("旺财"3);$cat = newCat("咪咪"2);echo$dog->info() . "\n";        // 继承自父类的方法echo$dog->speak() . "\n";       // 子类重写的版本echo$dog->fetch() . "\n";       // 子类特有的方法echo"\n";echo$cat->info() . "\n";echo$cat->speak() . "\n";echo$cat->catchMouse() . "\n";?>

代码讲解:

  • extends关键字表示继承,子类会拥有父类的所有属性和方法
  • 子类可以重写(override)父类的方法
  • $this->name在子类中仍然可以访问,因为是protected类型

四、静态属性和静态方法

不需要创建对象就能访问的成员:

<?phpclassMathHelper{// 静态属性:属于类,不属于对象publicstatic$pi = 3.14159;// 静态方法publicstaticfunctioncircleArea($radius{returnself::$pi * $radius * $radius;  // self:: 访问静态成员    }publicstaticfunctionadd(...$numbers{returnarray_sum($numbers);    }}// 不用创建对象,直接用类名调用echo"圆周率:" . MathHelper::$pi . "\n";echo"半径5的圆面积:" . MathHelper::circleArea(5) . "\n";echo"求和:" . MathHelper::add(12345) . "\n";?>

代码讲解:

  • static关键字表示静态成员
  • 静态成员属于类本身,不属于某个对象
  • ClassName::$propertyClassName::method()访问
  • 静态方法中用self::$property访问静态属性

五、接口

接口定义了一组方法签名,实现接口的类必须提供这些方法的具体实现:

<?php// 定义接口interfaceCanFly{publicfunctionfly();      // 接口只声明方法,不实现}interfaceCanSwim{publicfunctionswim();}// 实现接口classBirdimplementsCanFly{  // 用 implements 实现接口publicfunctionfly({return"鸟儿在天空飞翔!";    }}classFishimplementsCanSwim{publicfunctionswim({return"鱼儿在水里游泳!";    }}classDuckimplementsCanFlyCanSwim{  // 一个类可以实现多个接口publicfunctionfly({return"鸭子在天上飞!";    }publicfunctionswim({return"鸭子在水中游!";    }}// 测试$bird = newBird();$fish = newFish();$duck = newDuck();echo$bird->fly() . "\n";echo$fish->swim() . "\n";echo$duck->fly() . "\n";echo$duck->swim() . "\n";?>

六、Trait特性

Trait用于代码复用,类似"混入":

<?php// 定义TraittraitLogger{publicfunctionlog($message{echo"[" . date("Y-m-d H:i:s") . "] " . $message . "\n";    }}traitTimestamp{publicfunctioncreatedAt({$this->created_at = time();    }}// 使用TraitclassUser{useLoggerTimestamp;  // use 关键字引入Traitpublic$name;publicfunction__construct($name{$this->name = $name;$this->createdAt();  // 来自Timestamp trait$this->log("用户{$name}已创建");    }}classOrder{useLoggerTimestamp;public$order_id;publicfunction__construct($order_id{$this->order_id = $order_id;$this->createdAt();$this->log("订单{$order_id}已创建");    }}$user = newUser("张三");$order = newOrder("ORD20240315001");?>

代码讲解:

  • Trait用trait关键字定义
  • 类用use TraitName来引入Trait
  • 一个类可以使用多个Trait,用逗号分隔
  • Trait可以解决单继承的限制

七、命名空间

命名空间用于避免命名冲突:

<?phpnamespaceApp\Models;  // 声明命名空间classUser{public$name;publicfunctiongreet({return"你好,我是{$this->name}!";    }}namespaceApp\Services;classUser{  // 这个User和Models里的User是不同的public$role;publicfunctionpermission({return"权限:{$this->role}";    }}?>

在实际文件中,通常只声明一个命名空间:

<?php// 文件:Models/User.phpnamespaceApp\Models;classUser{public$name;}?>
<?php// 使用时require_once"Models/User.php";$user = newApp\Models\User();  // 完整限定名useApp\Models\User;            // use 导入$user = newUser();?>

八、实战:简单的学生成绩管理系统

<?php// 异常类classScoreExceptionextendsException{}// 学生类classStudent{private$name;private$scores = [];publicfunction__construct($name{$this->name = $name;    }publicfunctionaddScore($subject$score{if ($score < 0 || $score > 100) {thrownewScoreException("分数必须在0-100之间!");        }$this->scores[$subject] = $score;    }publicfunctiongetAverage({if (empty($this->scores)) return0;returnarray_sum($this->scores) / count($this->scores);    }publicfunctiongetInfo({$info = "学生:{$this->name}\n";$info .= "成绩:";foreach ($this->scores as$subject => $score) {$info .= "{$subject}={$score} ";        }$info .= "\n平均分:" . round($this->getAverage(), 1);return$info;    }}// 成绩管理类classScoreManager{private$students = [];publicfunctionaddStudent(Student $student{$this->students[] = $student;    }publicfunctiongetTopStudent({if (empty($this->students)) returnnull;$top = $this->students[0];foreach ($this->students as$student) {if ($student->getAverage() > $top->getAverage()) {$top = $student;            }        }return$top;    }publicfunctiongetClassAverage({if (empty($this->students)) return0;$total = 0;foreach ($this->students as$student) {$total += $student->getAverage();        }return$total / count($this->students);    }}// 使用$manager = newScoreManager();$student1 = newStudent("张三");$student1->addScore("数学"85);$student1->addScore("英语"92);$manager->addStudent($student1);$student2 = newStudent("李四");$student2->addScore("数学"95);$student2->addScore("英语"88);$manager->addStudent($student2);$student3 = newStudent("王五");$student3->addScore("数学"78);$student3->addScore("英语"82);$manager->addStudent($student3);echo"=== 学生成绩信息 ===\n\n";foreach ($manager->students as$student) {echo$student->getInfo() . "\n\n";}echo"=== 统计结果 ===\n";echo"班级平均分:" . round($manager->getClassAverage(), 1) . "\n";$top = $manager->getTopStudent();echo"最高分学生:" . $top->getInfo() . "\n";?>

九、写在最后

面向对象编程是编程思想的重大转变。从这篇文章开始,你已经掌握了OOP的基础知识:类、对象、继承、接口、Trait、命名空间。这些概念在PHP以及几乎所有现代编程语言中都是通用的。后续还需要多实践,慢慢体会面向对象设计的精髓。

这8篇文章涵盖了PHP大一新生需要掌握的核心知识。从环境搭建到变量数据类型,从运算符条件判断到循环结构,从函数到数组字符串,再到最后的面向对象,你的PHP编程之路才刚刚开始。多敲代码,多做项目,进步会越来越快的!加油!

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  1. CONNECT:[ UseTime:0.000647s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001129s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000325s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000295s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000466s ]
  6. SELECT * FROM `set` [ RunTime:0.000233s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000547s ]
  8. SELECT * FROM `article` WHERE `id` = 484231 LIMIT 1 [ RunTime:0.002240s ]
  9. UPDATE `article` SET `lasttime` = 1776766949 WHERE `id` = 484231 [ RunTime:0.000783s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000223s ]
  11. SELECT * FROM `article` WHERE `id` < 484231 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000538s ]
  12. SELECT * FROM `article` WHERE `id` > 484231 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000622s ]
  13. SELECT * FROM `article` WHERE `id` < 484231 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001707s ]
  14. SELECT * FROM `article` WHERE `id` < 484231 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000833s ]
  15. SELECT * FROM `article` WHERE `id` < 484231 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001315s ]
0.078838s