[PHP] CURL文件上传

一、说明

　　本文主要简述CURL进行文件上传的一般操作，基于TP5框架；

　　

二、前端

　　代码如下，需要填入对应的上传地址还有修改接收的参数名字(这里是 file)：

 <form  action="上传地址"  method="post" enctype="multipart/form-data">
        <input type="file" name="file"> 
        <button type="submit">上传</button>
    </form>

三、后端

　　下面是基于TP5的上传处理，通过CURL上传到另外一台服务器上。

<?php
namespace appcontroller;

use thinkController;

//文件上传类
class Upload extends Controller
{
    protected $file_size = 20971520;//20M
    protected $file_type = ["png", "jpg", "jpeg", "gif"];
    protected $ret = ['code'=>0, 'msg'=>'', 'data'=>[]];
    private $uploadUrl = "http://xxx.com";//上传地址

    public function doit()
    {
        try{
            $verify = $file->validate(['size'=>$this->file_size,'ext'=>$this->file_type]);
            if (!$verify) {
                throw new Exception('上传的文件大小超过20M, 或文件类型不正确');
            }

            $ext = pathinfo($file->getInfo('name'))['extension'];
            $tm = time();
            $mime = $file->getInfo('type');

            //表单请求参数
            $postData = [
                'file' => new CURLFile(realpath($file->getPathname()), $mime, $fileName.".{$ext}"),
            ];

            $curlRes = $this->curlUploadFile($this->uploadUrl, $postData);
            $res = json_decode($curlRes, true);

            if($res['code'] == 200 && $res['data']['filePath'] != ""){
                $this->ret['code'] = 200;
                $this->ret['msg'] = '文件上传成功';
                $this->ret['data'] = ['filePath' => $res['data']['filePath']];
            }else{
                throw new Exception('上传文件失败: '.$res['msg'], 500);
            }
        }catch(Exception $ex){
            //异常处理
            $this->ret['code'] = 500;
            $this->ret['msg'] = $ex->getMessage();
        }
        return json($this->ret);//返回json
    }


    //CURL文件上传
    private function curlUploadFile($url, $data)
    {
        $curl = curl_init();
        if (class_exists('CURLFile')) {
            curl_setopt($curl, CURLOPT_SAFE_UPLOAD, true);
            //$data = array('file' => new CURLFile(realpath($path)));//>=5.5
        } else {
            if (defined('CURLOPT_SAFE_UPLOAD')) {
                curl_setopt($curl, CURLOPT_SAFE_UPLOAD, false);
            }
            //$data = array('file' => '@' . realpath($path));//<=5.5
        }
        curl_setopt($curl, CURLOPT_URL, $url);
        curl_setopt($curl, CURLOPT_POST, 1 );
        curl_setopt($curl, CURLOPT_POSTFIELDS, $data);
        curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);
        $result = curl_exec($curl);
        $error = curl_error($curl);

        curl_close($curl);

        return $result;
    }
}