其实上传文件明白了道理也就很简单啦，小编当时学的时候也是一头雾水，搞了好多天才弄懂一点，好了废话少说吧，嘿嘿。首先运用的是tp3.2的框架，我这里前端名字是img.html
所以后台首先运用的是public function img()，然后选择上传的商品种类，再根据种类来选择固定的函数，而upload也就是确定所上传文件的格式还有保存路径等。最后再根据db_img上传到数据库。
首先是前端代码
<!DOCTYPE html><html><head> <title>后台管理</title> <link rel="stylesheet" type="text/css" href="__PUBLIC__/css/img.css"/></head><body> ?<header> ??<h1><img src="__PUBLIC__/image/admin_logo.png"/></h1> ??<ul class="rt_nav"> ???<li><a href="{:U(‘Login/img‘)}" target="_blank" class="website_icon">站点首页</a></li> ???<li><a href="{:U(‘Login/order2‘)}" class="admin_icon">查看交易</a></li> ???<li><a href="{:U(‘Login/loginprocess‘)}" class="quit_icon">安全退出</a></li> ??</ul> ?</header><aside class="lt_aside_nav content mCustomScrollbar"> <h2><a href="index.php">起始页</a></h2> <ul> ?<li> ??<dl> ???<dt>商品信息</dt> ???<!--当前链接则添加class:active--> ???<dd><a href="{:U(‘Login/img‘)}" >商品列表</a></dd> ???<dd><a href="{:U(‘Login/img‘)}" >商品分类</a></dd> ???<dd><a href="{:U(‘Login/img‘)}" >商品列表</a></dd> ???<dd><a href="{:U(‘Login/img‘)}" >商品信息</a></dd> ??</dl> ?</li> ?<li> ??<dl> ???<dt>订单信息</dt> ???<dd><a href="{:U(‘Login/order2‘)}">订单列表</a></dd> ???<dd><a href="{:U(‘Login/order3‘)}">用户购物车列表</a></dd> ??</dl> ?</li> ?<li> ??<p class="btm_infor">? 八号当铺 ?版权所有</p> ?</li> </ul></aside> ???<h2><strong style="color:grey;text-align: center;" >欢迎<span style="color:red">{$_SESSION[‘username‘]}</span>成为卖家</strong></h2> ????<section> ?????<h2><strong style="color:grey;">卖家上传</strong></h2> ?????<form method="POST" enctype="multipart/form-data"> ?????<ul class="ulColumn2"> ??????<li> ???????<span class="item_name" style="width:120px;">商品名称：</span> ???????<input type="text" class="textbox textbox_295" placeholder="文本信息提示..." name="f_name"/> ???????<!-- <span class="errorTips">错误提示信息...</span> --> ??????</li> ???????<li> ???????<span class="item_name" style="width:120px;">商品价格：</span> ???????<input type="text" class="textbox textbox_295" placeholder="文本信息提示..." name="money" /> ???????<!-- <span class="errorTips">错误提示信息...</span> --> ??????</li> ??????<li> ???????<span class="item_name" style="width:120px;">种类：</span> ???????<select class="select" name="sel"> ????????<option value="close">服装</option> ????????<option value="book">书刊</option> ????????<option value="dian">电子</option> ???????</select> ???????<!-- <span class="errorTips">错误提示信息...</span> --> ??????</li> ??<!-- ????<li> ???????<span class="item_name" style="width:120px;">是否热销：</span> ???????<label class="single_selection" ><input type="radio" value="y" />推荐</label> ???????<label class="single_selection"><input type="radio" value="n" />不推荐</label> ??????</li> --> ??????<li> ???????<span class="item_name" style="width:120px;">摘要：</span> ???????<textarea placeholder="摘要信息" class="textarea" style="width:500px;height:100px;" name="message"></textarea> ??????</li> ??????<li> ???????<span class="item_name" style="width:120px;">上传图片：</span> ???????<label class="uploadImg"> ????????<input type="file" name="file[]" /> ????????<span>上传图片</span> ???????</label> ??????</li> ??????<li> ???????<span class="item_name" style="width:120px;"></span> ???????<input type="submit" value="提交" class="link_btn"/> ??????</li> ?????</ul> ?????</form> ????</section> ????</body></html>
其次是后台（运用的是tp3.2框架）
// //后台添加图片
public function upload(){ ?// ??//实例化上传类 ?$upload ??????????= new \Think\Upload(); ?$upload->maxSize ?= 3145728; ?$upload->exts ????= [‘jpg‘, ‘jpeg‘, ‘gif‘, ‘png‘]; ?$upload->savePath = ‘./Public/Uploads/‘; ?$upload->rootPath = ‘./‘; ?$info ????????????= $upload->upload(); ?$upload ??????????= new Upload(); ???if (!$info) { ???$this->error($upload->getError()); ???// $this->error(‘shuangchuanshibai ‘,U(‘Login/loginss‘),2); ?} else { ???//$this->success(‘上传成功‘); ???return $info; ?}}public function insert(){ ?$login ?= D(‘logins‘); ?$result = $login->where([‘username‘ => $_SESSIN[‘username‘]])->field()->find(); ?// if(empty($_FILES)){ ?if (empty($_FILES)) { ???$this->error(‘请选择需要上传的文件‘); ?} ?if (!empty($_FILES)) { ???$arr = $this->upload(); ???foreach ($arr as $key => $value) { ?????$path[][‘savepath‘] = $value[‘savepath‘] . $value[‘savename‘]; ???} ???// $data[‘single‘]=‘推荐‘; ???$data[‘f_name‘] = $_POST[‘f_name‘]; ???// $data[‘create_time‘]=time(); ???$data[‘money‘] ???= $_POST[‘money‘]; ???$data[‘message‘] ?= $_POST[‘message‘]; ???$data[‘username‘] = $_SESSION[‘username‘]; ???// $data[‘create_time‘] = time ???// $data[‘login_id‘] = $result[‘id‘];(); ???????if (isset($data)) { ?????//如果上传文件的信息不为空，我们就将这些信息保存到数据库中 ?????$this->db_img($data, $path); ?????????} else { ?????$this->error(‘数据为空‘); ???} ?}}public function db_img($data, $path){ ?// if($_POST[‘sel‘]==‘close‘){ ?// ????????if($_POST[‘single‘]==‘y‘){ ?$file = D(‘file‘); ?$img ?= D(‘file_c‘); ?foreach ($path as $vo) { ???$data[‘savepath‘] = $vo[‘savepath‘]; ?} ?// $data[‘single‘] ="推荐"; ?$data[‘f_name‘] ?????= $_POST[‘f_name‘]; ?$data[‘username‘] ???= $_SESSION[‘username‘]; ?$t ??????????????????= time(); ?$data[‘create_time‘] = date("Y-m-d H:i:s", $t); ?$data[‘money‘] ??????= $_POST[‘money‘]; ?$data[‘message‘] ????= $_POST[‘message‘]; ?// $img->add(); ?if (!$img->create($data) || !$file->create($data)) { ???$this->error(‘上传失败‘); ?} else { ???if (!$img->add($data) || !$file->add($data)) { ?????$this->error(‘上传失败‘); ???} ?} ???$this->success(‘上传成功....‘, U(‘Login/img‘));}//insert1public function insert1(){ ?$login ?= D(‘logins‘); ?$result = $login->where([‘username‘ => $_SESSIN[‘username‘]])->field()->find(); ?// if(empty($_FILES)){ ?if (empty($_FILES)) { ???$this->error(‘请选择需要上传的文件‘); ?} ?if (!empty($_FILES)) { ???$arr = $this->upload(); ???foreach ($arr as $key => $value) { ?????$path[][‘savepath‘] = $value[‘savepath‘] . $value[‘savename‘]; ???} ???$data[‘f_name‘] ??= $_POST[‘f_name‘]; ???$data[‘money‘] ???= $_POST[‘money‘]; ???$data[‘message‘] ?= $_POST[‘message‘]; ???$data[‘username‘] = $_SESSION[‘username‘]; ???????if (isset($data)) { ?????//如果上传文件的信息不为空，我们就将这些信息保存到数据库中 ?????$this->db_img1($data, $path); ?????????} else { ?????$this->error(‘数据为空‘); ???} ?}}public function db_img1($data, $path){ ?// if($_POST[‘sel‘]==‘close‘){ ?// ????????if($_POST[‘single‘]==‘y‘){ ?$img ?= D(‘file_b‘); ?$file = D(‘file‘); ?foreach ($path as $vo) { ???$data[‘savepath‘] = $vo[‘savepath‘]; ?} ?$data[‘f_name‘] ?????= $_POST[‘f_name‘]; ?$data[‘username‘] ???= $_SESSION[‘username‘]; ?$t ??????????????????= time(); ?$data[‘create_time‘] = date("Y-m-d H:i:s", $t); ?$data[‘money‘] ??????= $_POST[‘money‘]; ?$data[‘message‘] ????= $_POST[‘message‘]; ?// $img->add($data); ?if (!$img->create($data) || !$file->create($data)) { ???$this->error(‘上传失败‘); ?} else { ???if (!$img->add($data) || !$file->add($data)) { ?????$this->error(‘上传失败‘); ???} ?} ?$this->success(‘上传成功....‘, U(‘Login/img‘));}//insert2public function insert2(){ ?$login ?= D(‘logins‘); ?$result = $login->where([‘username‘ => $_SESSIN[‘username‘]])->field()->find(); ?// if(empty($_FILES)){ ?if (empty($_FILES)) { ???$this->error(‘请选择需要上传的文件‘); ?} ?if (!empty($_FILES)) { ???$arr = $this->upload(); ???foreach ($arr as $key => $value) { ?????$path[][‘savepath‘] = $value[‘savepath‘] . $value[‘savename‘]; ???} ???$data[‘f_name‘] ??= $_POST[‘f_name‘]; ???$data[‘money‘] ???= $_POST[‘money‘]; ???$data[‘message‘] ?= $_POST[‘message‘]; ???$data[‘username‘] = $_SESSION[‘username‘]; ???????if (isset($data)) { ?????//如果上传文件的信息不为空，我们就将这些信息保存到数据库中 ?????$this->db_img2($data, $path); ?????????} else { ?????$this->error(‘数据为空‘); ???} ?}}public function db_img2($data, $path){ ?// if($_POST[‘sel‘]==‘close‘){ ?// ????????if($_POST[‘single‘]==‘y‘){ ?$img ?= D(‘file_d‘); ?$file = D(‘file‘); ?foreach ($path as $vo) { ???$data[‘savepath‘] = $vo[‘savepath‘]; ?} ?$data[‘f_name‘] ?????= $_POST[‘f_name‘]; ?$data[‘username‘] ???= $_SESSION[‘username‘]; ?$t ??????????????????= time(); ?$data[‘create_time‘] = date("Y-m-d H:i:s", $t); ?$data[‘money‘] ??????= $_POST[‘money‘]; ?$data[‘message‘] ????= $_POST[‘message‘]; ?// $img->add($data); ?if (!$img->create($data) || !$file->create($data)) { ???$this->error(‘上传失败‘); ?} else { ???if (!$img->add($data) || !$file->add($data)) { ?????$this->error(‘上传失败‘); ???} ?} ?$this->success(‘上传成功....‘, U(‘Login/img‘));}public function img(){ ???if (IS_POST) { ???if ($_POST[‘sel‘] == ‘close‘) { ?????$this->insert(); ???} ???if ($_POST[‘sel‘] == ‘book‘) { ?????$this->insert1(); ???} ???????if ($_POST[‘sel‘] == ‘dian‘) { ?????$this->insert2(); ???} ?} ?$this->display();}
php篇一 之上传文件
原文地址：https://www.cnblogs.com/skyyuan/p/8966435.html