create a folder and in there a subfolder with php

Question

I've tried soooo many times now and I couldn't find a solution!

My problem:

I want users to be able to upload images in the folder "user_images" (this folder exists already on the server). The php script shall create a specific user subfolder in "user_images". Like this -> "user_images/user_65/(imagesGoHere)"

I tried it like that, but it doesn't work ->

$userid = $_SESSION['user_id'];
$folder = "user_".$userid;
$upload_dir = "user_images/.$folder";           
$upload_path = $upload_dir; 

if(!is_dir($upload_dir)){
mkdir($upload_dir, 0777);
chmod($upload_dir, 0777);
}

Would be nice if someone could help me! Thx

Answer 1

您需要在此处指定第三个参数，即布尔值：

mkdir($upload_dir, 0777, true);

Answer 2

PHP can only create directories if it has the privileges in the parent directory to do so. As a word of warning, creating a folder per user is not a particularly scalable solution.

It shouldn't need to be recursive and chmodding after creation is pointless because mkdir does it already.