pupload.php

<style>
    body {
                background-color: #404040;
                color: white;
                text-align: center;
                font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
    			margin: auto;
	}
</style>
<?php
session_start();

// Check if the user is logged in, if not then redirect him to login page
if(!isset($_SESSION["loggedin"]) || $_SESSION["loggedin"] !== true){
    header("location: login.php");
    exit;
}


$userName = $_SESSION["username"];
$target_dir = "users/{$userName}/";
$target_file = $target_dir . basename($_FILES["fileToUpload"]["name"]);
$uploadOk = 1;
$imageFileType = strtolower(pathinfo($target_file,PATHINFO_EXTENSION));

if (!file_exists("users/{$userName}")) {
    mkdir("users/{$userName}", 0777, true);
}

// Check if file already exists
if (file_exists($target_file)) {
  echo "Sorry, file already exists.";
  $uploadOk = 0;
}

// Allow certain file formats
if($imageFileType != "pdf" && $imageFileType != "docx" && $imageFileType != "doc" ) {
  echo "Sorry, only PDF, DOCX, and DOC files are allowed.";
  $uploadOk = 0;
}

// Check file size
if ($_FILES["fileToUpload"]["size"] > 50000000) {
  echo "Sorry, your file is too large.";
  $uploadOk = 0;
}

// Check if $uploadOk is set to 0 by an error
if ($uploadOk == 0) {
  echo "Sorry, your file was not uploaded.";
// if everything is ok, try to upload file
} else {
  if (move_uploaded_file($_FILES["fileToUpload"]["tmp_name"], $target_file)) {
    echo "The file ". htmlspecialchars( basename( $_FILES["fileToUpload"]["name"])). " has been uploaded. Your Document has been uploaded to your personal folder.";
  } else {
    echo "Sorry, there was an error uploading your file.";
  }
}
?>
<!DOCTYPE html>
    <html>
    <head><meta name="viewport" content="width=device-width, initial-scale=1"></head>
    </html>