1. 多文件上传案例

文件夹结构

upload.php
common.php
uploads

uplaod.php

<?php
printf('<pre>%s</pre>', print_r($_FILES, true));
if (count($_FILES) > 0) {
    include './common.php';
    switch ($_GET['t']) {
        case 'alone':
            echo upload($_FILES['file']);
            break;
        case 'onebyone':
            foreach ($_FILES as $file) {
                //                echo  $file['name'];
                echo upload($file);
            }
            break;
        case 'multipart':
            $files = [];
            foreach ($_FILES['file']['error'] as $key => $value) {
                $files[] = [
                    'name'     => $_FILES['file']['name'][$key],
                    'type'     => $_FILES['file']['type'][$key],
                    'tmp_name' => $_FILES['file']['tmp_name'][$key],
                    'error'    => $_FILES['file']['error'][$key],
                    'size'     => $_FILES['file']['size'][$key],
                ];
            }
            foreach ($files as $file) {
                //                echo  $file['name'];
                echo upload($file);
            }
//            var_dump($files);
            break;
        default:
            echo '未知错误';
    }
}
?>
<!DOCTYPE html>
<html lang="en">
    <head>
        <meta charset="UTF-8">
        <title>图片上传</title>
        <style>
            form {
                width: 20em;
                margin: 1em auto;
            }
            fieldset {
                margin: 1em;
                display: grid;
                place-content: flex-start;
            }
            button[type=button] {
                margin-bottom: .5em;
            }
        </style>
    </head>
    <body>
        <form action="upload.php?t=alone" method="post" enctype="multipart/form-data">
            <fieldset>
                <label>单文件上传</label>
                <input type="hidden" name="MAX_FILE_SIZE" value="10485760">
                <input type="file" name="file">
                <button>upload</button>
            </fieldset>
        </form>
        <form action="upload.php?t=onebyone" method="post" enctype="multipart/form-data">
            <fieldset>
                <label>多文件上传: 逐个上传</label>
                <input type="hidden" name="MAX_FILE_SIZE" value="10485760">
                <input type="file" name="file1">
                <button type="button" onclick="oneByOne()">继续添加文件</button>
                <button>upload</button>
            </fieldset>
        </form>
        <form action="upload.php?t=multipart" method="post" enctype="multipart/form-data">
            <fieldset>
                <label>多文件上传: 一次性上传</label>
                <input type="hidden" name="MAX_FILE_SIZE" value="10485760">
                <input type="file" name="file[]" multiple>
                <button>upload</button>
            </fieldset>
        </form>
        <script>
            let oneByOneFileNameIndex = 1;
            // 动态添加逐个上传的input
            function oneByOne() {
                const dom = document.querySelector(`input[name=file${oneByOneFileNameIndex}]`);
                const input = document.createElement('input');
                input.type = 'file'
                input.name = 'file' + ++oneByOneFileNameIndex;
                dom.insertAdjacentElement('afterend', input);
            }
        </script>
    </body>
</html>

common.php

<?php
/**
 * 文件上传
 *
 * @param array $files: 一个文件的所有数据
 * @return string
 */
function upload(array $files): string
{
    // 获取文件名
    $name = $files['name'];
    // 获取临时文件的路径
    $tmpName = $files['tmp_name'];
    // 获取错误信息
    $error = $files['error'];
    if ($error === 0) {
        // 获取文件类型
        $type = strstr($files['type'], '/', true);
        // 获取文件后缀
        $ext = '.' . strtolower(pathinfo($files['name'], PATHINFO_EXTENSION));
        if ($type === 'image') {
            $path = "uploads/" . md5($name . date('Ymd') . str_pad(mt_rand(1, 9999), 5, '0', STR_PAD_LEFT)) . $ext;
            // 检测临时文件的合法性
            if (is_uploaded_file($tmpName)) {
                // 移动文件
                if (move_uploaded_file($tmpName, $path)) {
                    // 返回成功
                    return "<span><p style=\"color:green\">{$name}上传成功</p><img src='{$path}' width=250  alt='{$name}' /></span>";
                } else {
                    return '移动文件失败';
                }
            } else {
                return '临时文件不合法';
            }
        } else {
            return '上传类型错误';
        }
    } else {
        return upload_error($error);
    }
}
/**
 * 文件上传的错误信息集合
 *
 * @param int $errno: error代码
 * @return string
 */
function upload_error(int $errno): string
{
    switch ($errno) {
        case 1:
            $msg = '超过的单文件大小';
            break;
        case 2:
            $msg = '超过前端表单限制';
            break;
        case 3:
            $msg = '上传文件不完整';
            break;
        case 4:
            $msg = '没有文件被上传';
            break;
        case 6:
            $msg = '找不到临时目录';
            break;
        case 7:
            $msg = '写入失败,目标目录无写入权限';
            break;
        default:
            exit('未定义错误');
    }
    return $msg;
}

2.

MVC:
    M-模型(数据库相关的操作),
    V-视图(页面,html), 
    C-控制器(功能:1.获取数据 2.选择视图)
依赖注入: 简单那来说就是为了解决对象之间的耦合(`在一个类中调用其他类的实例`),例2.1:
    方法: 在类的外部实例化其他类, 然后以参数的方式传入.例:2.2:
服务容器: 将外部依赖(需要引用的外部类实例)进行统一的管理.例2.3

2.1

<?php
namespace test;
require './Model.php';
require './View.php';
// 服务容器
class Conn
// 控制器
class Controller
{
    public function index(): string
    {
        return (new View())->fetch((new \test\Model())->select()['data']);
    }
}

2.2

<?php
namespace test;
require './Model.php';
require './View.php';
// 控制器
class Controller
{
//    public function index(): string
//    {
//        return (new View())->fetch((new \test\Model())->select()['data']);
//    }
    protected $model;
    protected $view;
    public function __construct($model,$view) {
        $this->model = $model;
        $this->view = $view;
    }
    public function index(): string
    {
        return $this->view->fetch($this->model->select()['data']);
    }
}
$model = new Model();
$view = new View();
$controller = new Controller($model, $view);
echo $controller->index();

2.3

<?php
namespace test;
require './Model.php';
require './View.php';
// 服务容器
class Container
{
    // 对象容器
    protected $instanles = [];
    // 写入对象
    public function bind($alias, \Closure $process)
    {
        $this->instanles[$alias] = $process;;
    }
    // 取出对象
    public function make($alias, $params = [])
    {
        return call_user_func_array($this->instanles[$alias], $params);
    }
}
// 控制器
class Controller
{
    /*服务容器*/
    public function index(Container $instanles)
    {
        return $instanles->make('view')->fetch($instanles->make('model')->select()['data']);
    }
}

3. MVC简单案例(数据来源: https://www.php.cn/blog/detail/26509.html)

文件夹结构

Model.php
View.php
Controller.php
index.php

Model.php

<?php
namespace mvc_demo;
use PDO;
// 模型类
class Model
{
    // 获取数据
    public function getData()
    {
        $pdo = new PDO('mysql:dbname=phpedu', 'root', 'root');
        $stmt = $pdo->prepare('select * from staffs limit 10');
        $stmt->execute();
        return  $stmt->fetchAll(PDO::FETCH_ASSOC);
    }
}

View.php

<?php
namespace mvc_demo;
// 视图
class View
{
    // 数据展示
    public function fetch($data)
    {
        $table = '<table border="1" cellspacing="0">';
        $table .=    '<caption>员工信息表</caption>
   <tr bgcolor="lightcyan">
            <th>id</th>
            <td>姓名</td>
            <td>性别</td>
            <td>工资</td>
            <td>邮箱</td>
            <td>生日</td>
        </tr>';
        foreach ($data as $staff) {
            $table .= '<tr>';
            $table .= '<td>' . $staff['sid'] . '</td>';
            $table .= '<td>' . $staff['name'] . '</td>';
            $table .= '<td>' . $staff['gender'] . '</td>';
            $table .= '<td>' . $staff['salary'] . '</td>';
            $table .= '<td>' . $staff['email'] . '</td>';
            $table .= '<td>' . $staff['birthday'] . '</td>';
            $table .= '</tr>';
        }
        $table .= '</table>';
        return $table;
    }
}

Controller.php

<?php
namespace test;
require './Model.php';
require './View.php';
// 服务容器
class Container
{
    // 对象容器
    protected $instanles = [];
    // 写入对象
    public function bind($alias, \Closure $process)
    {
        $this->instanles[$alias] = $process;;
    }
    // 取出对象
    public function make($alias, $params = [])
    {
        return call_user_func_array($this->instanles[$alias], $params);
    }
}
// 控制器
class Controller
{
    //    public function index(): string
    //    {
    //        return (new View())->fetch((new \test\Model())->select()['data']);
    //    }
    /*依赖注入*/
    //    protected $model;
    //    protected $view;
    //
    //    public function __construct($model, $view)
    //    {
    //        $this->model = $model;
    //        $this->view = $view;
    //    }
    //
    //    public function index(): string
    //    {
    //        return $this->view->fetch($this->model->select()['data']);
    //    }
    /*服务容器*/
    public function index(Container $instanles)
    {
        return $instanles->make('view')->fetch($instanles->make('model')->select()['data']);
    }
}

index.php

<?php
/*服务容器*/
require './Controller.php';
$container = new \test\Container();
$container->bind('model', function (){return new \test\Model();});
$container->bind('view', function (){return new \test\View();});
$table = new \test\Controller();
?>
<!DOCTYPE html>
<html lang="en">
    <head>
        <meta charset="utf-8">
        <title>mvc</title>
    </head>
    <body>
        <?php echo $table->index($container);?>
    </body>
</html>

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