如何在php中将上传的文件重命名为Username？

Question

How to write code for to upload the file that file should be saved with Username instead of original name.

 <?php
    if ($_POST['upload'] )
     {
     $user=$_session['username'];// current username
     //$filename=basename($_FILES["file"]["name"]);



     $tmp=$_FILES["file"]["tmp_name"];
      $extension = explode("/", $_FILES["file"]["type"]);
      $name=$user.".".$extension[1];

    move_uploaded_file($tmp, "upload/" . $user.".".$extension[1]);
     }  

 ?>

Error :

Notice: Undefined variable: _session in C:\\xampp\\htdocs\\aaa\\upload file.php on line

Answer 1

当用户登录时，您是否在那时启动会话并将其存储在您正在使用的会话变量中，即$ _session ['username']

Answer 2

php SESSION syntax error

$user = $_SESSION['username'];

• $_SESSION is a special superglobal variable and needs to be in uppercase.

Answer 3

Try this code,

   <?php
    if ($_POST['upload'] )
   {
       $user=$_SESSION['username'];// current username

        $filename = $user."_".$_FILES["file"]["name"];
        $newFilePath = "./upload/".$filename;

        if(move_uploaded_file($_FILES["file"]["tmp_name"],$newFilePath)) 
         {
              return true;
         }
            else
            {
                return false;
            }

  }
 ?>

Answer 4

start the session on very top line and session should be always in upper case ie SESSION .

Please consider the below code :-

<?php
session_start();
if ($_POST['upload'] )
 {
 $user=$_SESSION['username'];// current username
 //$filename=basename($_FILES["file"]["name"]);

 $tmp=$_FILES["file"]["tmp_name"];
  $extension = explode("/", $_FILES["file"]["type"]);
  $name=$user.".".$extension[1];

move_uploaded_file($tmp, "upload/" . $name);