<?php

/**
 * Created by PhpStorm.
 * User: mac
 * Date: 2018/1/9
 * Time: 21:14
 */
class Upload
{
    protected $name;
    protected $allow_size;
    protected $allow_mime;
    protected $allow_ext;
    protected $upload;
    protected $upfile;
    protected $error = null;
    protected $extension;
    protected $newName;

    public function __construct(
        $upload = "./uploads",
        $name = 'pic',
        $allow_size = 3000000,
        $allow_mime = array('image/jpeg', 'image/gif'),
        $allow_ext = array('jpg', 'gif', 'png')
    )
    {
        $this->upload = $upload;
        $this->name = $name;
        $this->allow_size = $allow_size;
        $this->allow_mime = $allow_mime;
        $this->allow_ext = $allow_ext;

        //1,观察数组
        $this->upfile = $_FILES[$this->name];
        //name--type--temp_name--error--size
    }

    //2,判断错误

    public function upFile()
    {
        //观察数组,在构造方法中首先执行

        //判断错误
        $this->judgeError();
        //判断大小
        $this->judgeSize();
        //判断mime
        $this->judgeMime();
        //判断ext
        $this->judgeExt();

        if (is_null($this->error)) {
            //新建目录，文件名
            $this->createDir();
            //8,移动文件
            if (is_uploaded_file($this->upfile['tmp_name'])) {
                $res = move_uploaded_file($this->upfile['tmp_name'], $this->upload . '/' . $this->newName);
                if ($res) {
                    $info = array(
                        'name' => $this->upfile['name'],
                        'newname' => $this->newName,
                        'ext' => $this->extension,
                        'mime' => $this->upfile['type'],
                        'size' => $this->upfile['size']
                    );
                    return $info;
                }
            }
        }

    }

    //3,判断大小

    protected function judgeError()
    {
        if ($this->upfile['error'] > 0) {
            switch ($this->upfile['error']) {
                case 1:
                    $this->error = '超出php upload_max_filesize大小';
                    return false;
                case 2:
                    $this->error = '超出html MAX_FILE_SIZE大小';
                    return false;
                case 3:
                    $this->error = '只有部分文件';
                    return false;
                case 4:
                    $this->error = '没有文件上传';
                    return false;
                case 6:
                    $this->error = '找不到临时文件夹';
                    return false;
                case 7:
                    $this->error = '临时文件夹不可写';
                    return false;
            }
        }
    }

    //4,判断mime类型

    protected function judgeSize()
    {
        if ($this->upfile['size'] > $this->allow_size) {
            $this->error = '文件大小超出了指定范围';
            return false;
        }
    }

    //5,判断扩展名

    protected function judgeMime()
    {
        if (!in_array($this->upfile['type'], $this->allow_mime)) {
            $this->error = 'mime类型不被允许';
            return false;
        }
    }

    protected function judgeExt()
    {
        $this->extension = pathinfo($this->upfile['name'], PATHINFO_EXTENSION);
        if (!in_array($this->extension, $this->allow_ext)) {
            $this->error = '扩展名不允许';
            return false;
        }
    }

    protected function createDir()
    {
        //6,新建目录

        if (!file_exists($this->upload)) {
            mkdir($this->upload, 0755);
        }
        //7,准备随机文件名
        $this->newName = md5(time(), mt_rand()) . '.' . $this->extension;
    }

    public function getError()
    {
        return $this->error;
    }
}