<?php


class Upload {
    private $_max_size;
    private $_type_map;
    private $_allow_ext_list;
    private $_allow_mime_list;
    private $_upload_path;
    private $_prefix;

    private $_error;//当前的错误信息
    public function getError() {
        return $this->_error;
    }

    public function __construct() {
        $this->_max_size = 1024*1024;
        $this->_type_map = array(
            ‘.png‘     => array(‘image/png‘, ‘image/x-png‘),
            ‘.jpg‘    => array(‘image/jpeg‘, ‘image/pjpeg‘),
            ‘.jpeg‘    => array(‘image/jpeg‘, ‘image/pjpeg‘),
            ‘.gif‘    => array(‘image/gif‘),
            );
        $this->_allow_ext_list = array(‘.png‘, ‘.jpg‘);
        $allow_mime_list = array();
        foreach($this->_allow_ext_list as $value) {
            //得到每个后缀名
            $allow_mime_list = array_merge($allow_mime_list, $this->_type_map[$value]);
        }
        // 去重
        $this->_allow_mime_list = array_unique($allow_mime_list);
        $this->_upload_path = ‘./‘;
        $this->_prefix = ‘‘;
    }

    public function __set($p, $v) {//属性重载
        $allow_set_list = array(‘_upload_path‘, ‘_prefix‘, ‘_allow_ext_list‘, ‘_max_size‘);
        //可以不加：_ 进行设置
        if(substr($p, 0, 1) !== ‘_‘) {
            $p = ‘_‘ . $p;
        }

        $this->$p = $v;
    }


    /**
     * 上传单个文件
     */
    public function uploadOne($tmp_file) {

        # 是否存在错误
        if($tmp_file[‘error‘] != 0) {
            $this->_error = ‘文件上传错误‘;
            return false;
        }

        # 尺寸
        if ($tmp_file[‘size‘] > $this->_max_size) {
            $this->_error = ‘文件过大‘;
            return false;
        }

        # 类型
        # 保证修改允许的后缀名，就可以影响到$allow_ext_list和$allow_mime_list
        # 设置一个后缀名与mime的映射关系
        
        # 后缀，从原始文件名中提取
        $ext = strtolower(strrchr($tmp_file[‘name‘], ‘.‘));
        if (!in_array($ext, $this->_allow_ext_list)) {
            $this->_error = ‘类型不合法‘;
            return false;
        }
        # MIME, type元素。
        // $allow_mime_list = array(‘image/png‘, ‘image/gif‘, ‘image/jpeg‘, ‘image/pjpeg‘, ‘image/x-png‘);
        
        if (!in_array($tmp_file[‘type‘], $this->_allow_mime_list)) {
            $this->_error = ‘类型不合法‘;
            return false;
        }
        //PHP自己获取文件的mime，进行检测
        $finfo = new Finfo(FILEINFO_MIME_TYPE);//获得一个可以检测文件MIME类型信息的对象
        $mime_type = $finfo->file($tmp_file[‘tmp_name‘]);//检测
        if (!in_array($mime_type, $this->_allow_mime_list)) {
            $this->_error = ‘类型不合法‘;
            return false;
        }


        # 移动
        # 上传文件存储地址
        //创建子目录
        $subdir = date(‘YmdH‘) . ‘/‘;
        if(!is_dir($this->_upload_path . $subdir)) {//检测是否存在
            //不存在
            mkdir($this->_upload_path . $subdir);
        }
        # 科学起名
        $upload_filename = uniqID($this->_prefix, true) . $ext;
        if (move_uploaded_file($tmp_file[‘tmp_name‘], $this->_upload_path . $subdir . $upload_filename)) {
            // 移动成功，返回文件名
            return $subdir . $upload_filename;
        } else {
            // 移动失败
            $this->_error = ‘移动失败‘;
            return false;
        }

    }
}