php
```
if ($this->request->isPost()) {
$file_get = $_FILES['file']; //获取文件
$file_name = $file_get['name']; //文件名
if (!$_FILES['file']['tmp_name']||!$_FILES['file']['name']){
$this->error('请选择文件');
}
$fs_lswn = $file_get['tmp_name'];
$fs_site = "../public/{$file_name}"; // 要上传的文件地址
$filename = move_uploaded_file($fs_lswn,$fs_site); //上传图像
if($filename){
$this->success('文件上传成功！');
}else{
$this->error("失败：{$file_name}-{$filename}");
}
}
```
html
```
<form class="layui-form" method="post" enctype="multipart/form-data">
<div class="layui-form-item">
<label class="layui-form-label">文件</label>
<div class="layui-input-block">
<input type="file" name="file" class="layui-input">
<div class="layui-form-mid layui-word-aux">为保证安全，仅支持上传txt、jpg、png、ico文件</div>
</div>
</div>
<div class="layui-form-item">
<div class="layui-input-block">
<button class="layui-btn" type="submit" lay-submit lay-filter="*">立即提交</button>
</div>
</div>
</form>
```
