Storing form field id in a variable during file upload

[invision]

Hello!

I have a basic script that allows me to upload multiple files to my server - yay!

Now, I'd like to be able to associate a variable with the input element that holds that particular image.

Dream world would be being able to store $imgnumber = "9"; in my loop if I upload an image to the image_9 field.

HTML Code:

<input id="image_9" name="images[]" type="file"  />	
<input id="image_11" name="images[]" type="file"  />

PHP Code:

if (isset($_POST['Submit'])) { 
    $number_of_file_fields = 0; 
    $number_of_uploaded_files = 0; 
    $number_of_moved_files = 0; 
    $uploaded_files = array(); 
    $upload_directory = dirname(__file__) . '/uploaded/'; //set upload directory 
    /** 
     * we get a $_FILES['images'] array , 
     * we process this array while iterating with simple for loop 
     * you can check this array by print_r($_FILES['images']); 
     */ 
    for ($i = 0; $i < count($_FILES['images']['name']); $i++) { 
        $number_of_file_fields++; 
        if ($_FILES['images']['name'][$i] != '') { //check if file field empty or not 
            $number_of_uploaded_files++; 
            $uploaded_files[] = $_FILES['images']['name'][$i]; 
            if (move_uploaded_file($_FILES['images']['tmp_name'][$i], $upload_directory . $_FILES['images']['name'][$i])) { 
                $number_of_moved_files++; 
                // $varnumber = FORM_ELEMENT_ID 
            } 
  
        } 
  
    } 
    echo "Number of File fields created $number_of_file_fields.<br/> "; 
    echo "Number of files submitted $number_of_uploaded_files . <br/>"; 
    echo "Number of successfully moved files $number_of_moved_files . <br/>"; 
    echo "File Names are <br/>" . implode(',', $uploaded_files); 
} 

Many thanks for any pointers here :-D