PHP文件上传类

<?php

/**
 * 上传文件类
 * Class UploadFile
 * 使用方法
 *  $this->load->library('uploadfile',['path','jpg,png,pdf','2','file']);
 *  $this->uploadfile->upload();
 *  数组参数1: 目录  可不传 默认 class_upload_file
 *  数组参数2: 允许上传的类型 可不传 默认 全部类型
 *  数组参数3: 限制大小(M) 可不传 不限制文件大小
 *  数组参数4: $_FILES key名称 可不传 默认 file
 */
class UploadFile
{

    protected $code = 0;
    protected $data = [];
    protected $msg = [ #错误返回提示
        '0' => '上传成功',
        '1' => '上传失败',
        '2' => '文件不存在',
        '3' => '文件key错误',
        '4' => '文件超过限制大小',
        '5' => '文件格式不正确',
    ];

    protected $path = 'class_upload_file'; # 文件目录
    protected $type = ''; # 文件类型
    protected $size = 0; # 文件大小限制 0不限制
    protected $name = 'file';# 文件KEY名称
    protected $url = ''; # 返回路径

    /**
     * UploadFile constructor.
     * @param $params array($path,$size)
     */
    public function __construct($params)
    {
        $field = ['path', 'type', 'size', 'name'];
        if ($params) {
            foreach ($params as $key => $val) {
                $_field = $field[$key];
                !empty($params[$key]) && $this->$_field = $val;
            }
        }
        $this->url = '/upload/' . $this->path . '/';
        $this->path = str_replace("\\", '/', ROOTPATH) . $this->url;
    }

    /**
     * 错误返回
     * @param $code
     * @return array
     */
    protected function error($code)
    {
        return ['code' => '1', 'msg' => $this->msg[$code], 'data' => []];
    }

    /**
     * 成功返回
     * @param $data
     * @return array
     */
    protected function success($data)
    {
        return ['code' => 0, 'msg' => $this->msg[0], 'data' => $data];
    }

    /**
     * 判断文件是否存在
     */
    protected function checkFileExist()
    {
        empty($_FILES) && $this->code = 2;
        empty($_FILES[$this->name]) && $this->code = 3;
    }

    /**
     * 判断文件后缀是否符合
     */
    protected function checkFileType()
    {
        if ($this->type && !in_array(pathinfo($_FILES[$this->name]['name'], PATHINFO_EXTENSION), explode(',', $this->type)))
            $this->code = 5;
    }

    /**
     * 判断文件是否超过设置的大小
     */
    protected function checkFileSize()
    {
        if ($this->size > 0)
            $_FILES[$this->name]['size'] > ($this->size * 1048576) && $this->code = 4;
    }

    /**
     * 判断文件夹是否存在
     */
    protected function filePathCreate()
    {
        if (!is_dir($this->path))
            mkdir($this->path, 0777, true);
    }

    /**
     * 文件上传
     */
    protected function saveFile()
    {
        $this->code = 1;
        if ($_FILES[$this->name]['error'] === 0) {
            $ext = strtolower(pathinfo($_FILES[$this->name]['name'], PATHINFO_EXTENSION));
            $fileName = md5(uniqid(microtime(true), true)) . "." . $ext;
            if (move_uploaded_file($_FILES[$this->name]['tmp_name'], $this->path . $fileName)) {
                $this->code = 0;
                return $this->data = [
                    'name' => $_FILES[$this->name]['name'],
                    'url' => $this->url . $fileName,
                ];
            }
        }
    }

    /**
     * 不限制文件类型
     * @return array
     */
    function upload()
    {
        $methods = ['checkFileExist', 'checkFileSize', 'checkFileType', 'filePathCreate', 'saveFile'];
        foreach ($methods as $method) {
            $this->$method();
            if ($this->code != 0)
                return $this->error($this->code);
        }
        return $this->success($this->data);
    }
}