类的自动加载

类与面向对象编程

• 创建类: 用Class关键字声明
• 成员属性前必须要有访问修饰符:public, protected, private;

<!-- 自动加载器 -->

<?php

/**
 * 类的自动加载器 前提 类名称跟类文件名称保持一致 psr-4规范
 */

spl_autoload_register(function ($classname) {
    $file = __dir__ . DIRECTORY_SEPARATOR . 'vender' . DIRECTORY_SEPARATOR . $classname . '.php';

    if (!(is_file($file) && file_exists($file))) {
        throw new \Exception('文件名不合法或者文件不存在');
    }

    require $file;
});

<!-- 声明类 -->

<?php

// 声明一个类
Class HumanResources
{
    // 类属性
    protected $name;
    protected $age;
    protected $entrantDate;
    protected $department;
    protected $position;

    // 构造函数类实例化时自动调用
    public function __construct($name, $age, $entrantDate, $department, $position, $jobResponsibilities)
    {
        // 类成员之间的互相访问  $this 本对象
        // 1.初始化类成员 让类/对象的状态稳定下来
        // 2.给对象的属性进行初始化赋值
        // 3.给私有或者受保护的成员属性赋值
        $this->name = $name;
        $this->age = $age;
        $this->entrantDate = $entrantDate;
        $this->department = $department;
        $this->position = $position;
        $this->jobResponsibilities = $jobResponsibilities;
    }

    // 类方法
    public function staffInfo() {
        echo '姓名: ' .$this->name .'<br>';
        echo '年龄: ' .$this->age .'<br>';
        echo '入职日期: '.$this->entrantDate .'<br>';
        echo '部门: ' .$this->department .'<br>';
        echo '职务: ' .$this->position .'<br>';
        echo '岗位职责: ' .$this->jobResponsibilities.'<br>';
    }

}

<!-- 在客户端自动加载调用类 -->

<?php

require 'autoload.php';

$name = 'help';
$age = '28';
$entrantDate = '2020';
$department = 'HrDepart';
$position = 'humanSupervisor';
$jobResponsibilities = 'salaryAccounting';

$hr = new HumanResources($name, $age, $entrantDate, $department, $position, $jobResponsibilities);

$hr->staffInfo();
echo '<hr>';