1. 配置文件

设置上传的路径

对应文件夹

2. 前端

<div class="card-body"><h1 class="card-title">用户头像</h1><img src="../../../uploads/{$user.avatar_photo_path}" alt="avatar"  height="100"/><form class="forms-sample" action="保存路径" method="post" enctype="multipart/form-data">选择图片（最大0.5M，格式jpg,jpeg,png）：<input type="file" name="user_avatar_image"/>              <button type="submit" class="btn btn-primary mr-2">上传</button></form>
</div>

3. 后端

  /*** 保存用户头像*/function do_save_user_avatar()
{// 字段名$field_name = 'user_avatar_image';if(request()->isPost()){try {// 获取表单上传文件 例如上传了001.jpg$file = request()->file($field_name);// 使用验证器验证上传的文件validate(['file' => [// 限制文件大小(单位b)，这里限制为1M'fileSize' => 0.5 * 1024 * 1024,// 限制文件后缀，多个后缀以英文逗号分割'fileExt'  => 'jpg,jpeg,png']])->check(['file' => $file]);// 上传到本地服务器// public/uploads文件夹下的profile文件夹$save_name = \think\facade\Filesystem::disk('public')->putFile('profile', $file);if($save_name){// 要更新的数据库// // 上传之后的操作return  $this->success('上传成功', '跳转路径');}} catch (\Throwable $e) {return $this->error('上传图片失败，' . $e->getMessage());}}}

注意：try catch中捕捉错误，是\Throwable $e

也可单独封装出一个上传文件的函数，包含压缩图片

// 需要安装composer require topthink/think-image
/*** 上传文件* $field_name = 'user_avatar_image';* $subdirectory public下的哪个子目录* $fileSize = 0.5 (单位为M)* $compressionRatio = 0.8 压缩成原来的80%* $fileExt 文件格式字符串* $is_image_thumb = 0, 图片是否压缩* $thumb_threshold = 0.5, 图片的size大于多少才压缩，单位M* $thumb_width = 500, 压缩的宽* $thumb_height = 500,  压缩的高*/
function uploadFile($field_name, $subDirectory, $fileSize = 1, $fileExt = 'jpg,jpeg,png', $is_image_thumb = 0, $thumb_threshold = 0.5, $thumb_width = 500, $thumb_height = 500)
{// 获取表单上传文件 例如字段名是'user_avatar_image'if(!array_key_exists($field_name, $_FILES)){$response = [];$response['code'] = 100;$response['msg'] = 'FILES中不存在该变量';$response['data'] = [];return  $response;}else{   // 变量'user_avatar_image'没有值if($_FILES[$field_name]['error'] != 0){$response = [];$response['code'] = 200;$response['msg'] = '没有上传文件';$response['data'] = [];return  $response;}}if(request()->isPost()){try {// 获取表单上传文件 例如上传了001.jpg$file = request()->file($field_name);// 使用验证器验证上传的文件validate(['file' => [// 限制文件大小(单位b)，这里限制为1M'fileSize' => $fileSize * 1024 * 1024,// 限制文件后缀，多个后缀以英文逗号分割'fileExt'  => $fileExt]])->check(['file' => $file]);// 上传到本地服务器// uploads文件夹下的profile文件夹$save_name = '';// 是否需要压缩if($is_image_thumb == 0 || $file->getSize() < $thumb_threshold * 1024 * 1024){// 路径有日期文件夹$save_name = \think\facade\Filesystem::disk('public')->putFile($subDirectory, $file);}else{// 获取上传的图片，进行图片压缩$image = \think\Image::open($file);// 保存图片的路径处理$date = date('Ymd');$save_name = public_path() . 'uploads/' . $subDirectory . '/' . $date . '_' . $file->md5() . '.jpg';// 保存// 默认会按比例保存，但是最大宽度、高度不超过thumb(400, 400)设定值$img_edit = $image->thumb($thumb_width, $thumb_height)->save($save_name);}if($save_name){$response = [];$response['code'] = 1;$response['msg'] = '上传成功';$response['data']['save_name'] = $save_name;return $response;}} catch (\Throwable $e) {$response = [];$response['code'] = 300;$response['msg'] = '上传失败，' . $e->getMessage();$response['data'] = [];return $response;}}$response = [];$response['code'] = 400;$response['msg'] = '上传失败，非POST请求';$response['data'] = [];return $response;}

上传成功之后，如图

by 软件工程小施同学