I am a beginner in PHP coding. I try to create a page using $_FILES under XAMPP localhost environment. PHP is 7.2.7 version. The problem is that, when I click the submit button to upload the file, nothing happens. (I use a "if...else" loop to see if all conditions not happen, and the result is nothing happen.)
HTML:
<form action="upload.php" method="POST" enctype="multipart/form-data">
    <label for="file">File upload:</label> 
    <input type="file" name="User Name">
    <br><br>
    <input type="submit">
    <br><br> 
</form>  
PHP:
if(isset($_POST['submit'])){
  if ($_FILES["file"]["error"] > 0)
  {
    echo "Error: " . $_FILES["file"]["error"] . "<br />";
  }
  else
  {
    echo "Upload: " . $_FILES["file"]["name"] . "<br />";
    echo "Type: " . $_FILES["file"]["type"] . "<br />";
    echo "Size: " . ($_FILES["file"]["size"] / 1024) . " Kb<br />";
    echo "Stored in: " . $_FILES["file"] ["tmp_name"];
  }
}
else {
  echo "nothing";
}
 
     
     
    