定义文件上传类 Upload.php

1.定义文件上传类 Upload.php

class Upload
{
    private $path;
    private $size;
    private $type;
    private $error;
    public function __construct($path, $size, $type)
    {
        $this->path = $path;
        $this->size = $size;
        $this->type = $type;
    }
    // 返回错误信息
    public function getError()
    {
        return $this->error;
    }
    // 验证上传是否有误
    public function checkError($files)
    {
        // 1. 验证错误号
        if ($files['error'] != 0) {
            switch ($files['error']) {
                case 1:
                    $this->error = '文件大小超过了php.ini中允许的最大值,最大值是：'.ini_get('upload_max_filesize');
                    return false;
                case 2:
                    $this->error = '文件大小超过了表单允许的最大值';
                    return false;
                case 3:
                    $this->error = '只有部分文件上传成功';
                    return false;
                case 4:
                    $this->error = '没有文件上传成功';
                    return  false;
                case 6:
                    $this->error = '找不到临时文件';
                    return  false;
                case 7:
                    $this->error = '文件写入失败';
                    return false;
                default:
                    $this->error = '未知错误';
                    return  false;
            }
        }
        // 2. 验证格式
        $info = finfo_open(FILEINFO_MIME_TYPE);
        $mime = finfo_file($info, $files['tmp_name']);
        if (!in_array($mime, $this->type)) {
            $this->error = '只能上传'.implode(',', $this->type).'格式';
            return false;
        }
        // 3. 验证大小
        if ($files['size'] > $this->size) {
            $this->error = '文件大小不能超过HTTP POST上传的';
            return false;
        }
        if (!is_uploaded_file($files['tmp_name'])) {
            $this->error = '文件不是HTTP POST上传的';
            return false;
        }
        return  true;
    }
    // 文件上传
    public function uploadOne($files)
    {
        if ($this->checkError($files)) { // 没有错误就上传
            $folderName = date('Y-m-d');  // 文件夹名
            $folderPath = $this->path . $folderName;  // 文件夹路径
            if (!is_dir($this->path))
                mkdir($this->path,0777);
            if (!is_dir($folderPath))
                mkdir($folderPath,0777);
            $fileName = uniqid('', true) . strrchr($files['name'], '.'); //文件名
            $filePath = "$folderPath / $fileName";
            if (move_uploaded_file($files['tmp_name'], $filePath)) {
                return "${$folderPath} / {$fileName}";
            } else {
                $this->error = '上传失败<br>';
                return false;
            }
        }
        return false;
    }
}
2.上传页 index.html
<form action="doupload.php" method="post" enctype="multipart/form-data">
    <input type="file" name="file" id="file">
    <button type="submit" id="btn">上传</button>
</form>
3.处理上传 doupload.php
require 'Upload.php';
$path = './uploads/';
$size = 5242880;
$type = ['image/png','image/jpeg','image/gif','image/jpg','image/wbmp'];
$upload = new Upload($path, $size, $type);
$file = $_FILES['file'];
if ( $info = $upload->uploadOne($file)) {
    echo '上传成功' . $info;
} else {
    echo $upload->getError();
    // 错误写入文件
    file_put_contents('log.text', $upload->getError());