php - How do I correctly call the $_SESSION variable in PHP?

Question

I am trying to call the $_SESSION username variable so that It will show in a URL like

/users/USERNAME/

I know there's a way to do this, but I must be doing it wrong because here's the error I get: Parse error: syntax error,

unexpected T_ENCAPSED_AND_WHITESPACE, expecting T_STRING or 
T_VARIABLE or T_NUM_STRING

What am I doing wrong to get this, and how can I fix it?

Here's the code I'm using:

move_uploaded_file( $_FILES['md']['tmp_name'], 
"users/'.$_SESSION['username'].".$_FILES['md']['name'] );

Answer 1

错误的混合"和'一个"缺失

    move_uploaded_file( $_FILES['md']['tmp_name'], "users/".$_SESSION['username']."/".$_FILES['md']['name'] );

Answer 2

你有一个解析错误。

"users/"

不是

"users/'

Answer 3

你没有在连接之前关闭你的字符串。

 move_uploaded_file( $_FILES['md']['tmp_name'], "users/" . $_SESSION['username'] . $_FILES['md']['name'] );

Answer 4

你的代码有错误，试试这个

 move_uploaded_file( $_FILES['md']['tmp_name'],"users/".$_SESSION['username'].$_FILES['md']['name'] );

或者

move_uploaded_file( $_FILES['md']['tmp_name'],"users/".$_SESSION['username']."/".$_FILES['md']['name'] );