实例 | layui上传图片并存入数据库

<!--html-->
<button type="button" class="layui-btn" id="up_pic">上传图片</button>
<input class="input pic_input" type="text" size="40" name="thread[pic]" id="contentPic" />
<img class="layui-upload-img" id="demo1" src="">

<!--jq-->
<script type="text/javascript">
layui.use('upload', function(){
var $ = layui.jquery
,upload = layui.upload;

//普通图片上传
var uploadInst = upload.render({
elem: '#up_pic'
,url: '__APP__/public/upload2.html'
,before: function(obj){
//预读本地文件示例，不支持ie8
obj.preview(function(index, file, result){
$('#demo1').attr('src', result); //图片链接（base64）
});
}
,done: function(res){
//如果上传失败
if(res.code > 0){
return layer.msg('上传失败');
}
$('#contentPic').val('/'+res.url);

//上传成功
}
,error: function(){
//演示失败状态，并实现重传
var demoText = $('#demoText');
demoText.html('<span style="color: #FF5722;">上传失败</span> <a class="layui-btn layui-btn-xs demo-reload">重试</a>');
demoText.find('.demo-reload').on('click', function(){
uploadInst.upload();
});
}
});
});
</script>

<!--php-->

public function upload2(){
// echo "<pre>";
// var_dump($_FILES);die;
$fileName = $_FILES['file']['name'];//文件名
$tmpName = $_FILES['file']['tmp_name'];//临时存放的目录
$fileError = $_FILES['file']['error'];
$fileType = $_FILES['file']['type'];
$fileSize = $_FILES['file']['size'];

if($fileError>0){
switch($fileError){
case 1:
echo "上传的文件超过了 php.ini 中 upload_max_filesize 选项限制的值";
break;
case 2:
echo "上传文件的大小超过了 HTML 表单中 MAX_FILE_SIZE 选项指定的值";
break;
case 3:
echo "文件只有部分被上传";
break;
case 4:
echo "没有文件被上传";
break;
case 6:
echo "找不到临时文件夹。PHP 4.3.10 和 PHP 5.0.3 引进";
break;
case 7:
echo "文件写入失败。PHP 5.1.0 引进";
break;
}
} 
$ext = pathinfo($fileName,PATHINFO_EXTENSION);//类型
$saveName = date('Ymd').mt_rand(1,100).'.'.$ext;
//生成保存路径
$uploads = "uploads/";

$path = rtrim($uploads,'/')."/".date('Y/m/d/');
if(!file_exists($path)){
mkdir($path,0777,true);
}
$saveFile = $path .$saveName;
if(move_uploaded_file($tmpName,$saveFile)){
// echo "上传成功";
$ret['message']="成功";
$ret['status'] = 1;
$ret['url'] = $saveFile;
echo json_encode($ret);
}else{
// echo "上传失败啊";
$ret['message']="失败";
$ret['status'] = 0;
echo json_encode($ret);
}
}