File upload function

1, Upload file front-end code:

Add the following code to the netdisk_html.php file

<?php
<form method="post" enctype="multipart/form-data">
    <input type="file" name="file">
    <input type="submit" value="上传">
</form>

2, From the front-end code, we can know that through the post method When submitting a file upload request, don’t forget to add enctype="multipart/form-data"

On the index.php interface, you only need to operate the uploaded file to upload and write successfully. The database can be displayed on the front end

<?php
//获取post提交的上传文件的信息
$uploadfile=isset($_FILES['file'])?$_FILES['file']:"";
//上传文件功能
if(!empty($uploadfile)){
if($uploadfile['error']==0){
//上传成功
$uploadfile_name=trim($uploadfile['name']);
//判断文件名是否存在
$sql="select file_name from netdisk_file  where file_name='$uploadfile_name' and folder_id=$folder_id";
$allfolder=fetchRow($sql);
if($allfolder){
echo "上传的文件不能重名";
}else{
//文件未重名的情况
//保存路径
$uploadfile_save="./uploads/".date('Y-m-d')."/";//保存到/uploads/2018-3-2/里
if(!file_exists($uploadfile_save)){
mkdir($uploadfile_save,0777,true);
}
$new_uploadfile_name=uniqid().".jpg";
$uploadfile_save.=$new_uploadfile_name;
if(move_uploaded_file($uploadfile['tmp_name'],$uploadfile_save)){
//上传成功,并写入数据库
$uploadfile_size=filesize($uploadfile_save);
$sql="insert into netdisk_file (file_name,file_save,file_size,file_time,folder_id) values('$new_uploadfile_name','$uploadfile_save',$uploadfile_size,now(),$folder_id)";
if(!mysql_query($sql)){
unlink($uploadfile_save);
echo "写入数据库出错";
}
}
}
}else{
//上传失败
}
//    print_r($uploadfile);
}

3, results display: