mw_odd_job/app/mobile/controller/Com.php

<?php

namespace app\mobile\controller;

use app\common\model\Attachment as AttachmentModel;

class Com
{
    /**
     * 图片上传
     */
    public function imageUpload()
    {
        $file = input('post.file');
        $name = input('post.name');
        $ext  = pathinfo($name)['extension'];
        if (!in_array($ext, ['jpg', 'jpeg', 'png'])) {
            $this->error('文件后缀必须为jpg，jpeg，png');
        }

        if ($file) {
            //创建目录
            $upload_dir = public_path() . 'public/attachment/images/' . date('Ymd');
            if (!is_dir($upload_dir)) {
                mkdir($upload_dir, '0777', true);
            }

            //保存文件
            $file_name = $this->_file_name($ext);
            $file_path = '/attachment/images/' . $file_name;
            $is_upload = $this->_base64_image_content($file, $file_path);
            if (!$is_upload) {
                page_result(1, "上传失败，请重新上传");
            }

            $attachment = request()->domain() . $file_path;
            AttachmentModel::create([
                'filename'   => $name,
                'atype'      => 1,
                'attachment' => $attachment,
                'createtime' => time(),
            ]);

            page_result(0, '', ['avatar' => $attachment]);
        } else {
            page_result(1, "请上传文件");
        }
    }

    private function _file_name($ext)
    {
        //生成随机文件名
        //定义一个包含大小写字母数字的字符串
        $chars = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
        //把字符串分割成数组
        $newchars = str_split($chars);
        //打乱数组
        shuffle($newchars);
        //从数组中随机取出15个字符
        $chars_key = array_rand($newchars, 15);
        //把取出的字符重新组成字符串
        $fnstr = '';
        for ($i = 0; $i < 15; $i++) {
            $fnstr .= $newchars[$chars_key[$i]];
        }
        //输出文件名并做MD5加密
        return md5($fnstr . microtime(true) * 1000) . '.' . $ext;
    }

    private function _base64_image_content($base64_image_content, $file_url_path)
    {
        //匹配出图片的格式
        if (preg_match('/^(data:\s*image\/(\w+);base64,)/', $base64_image_content, $result)) {
            $content   = base64_decode(str_replace($result[1], '', $base64_image_content));
            $file_path = public_path('') . 'public' . $file_url_path;
            if (file_put_contents($file_path, $content)) {
                return true;
            } else {
                return false;
            }
        } else {
            return false;
        }
    }
}