Android Question upload file With php

hc.Initialize("hc")
        Dim Response As HttpResponse
        Dim fromserver As String

    'Add files
    Dim files As List
    files.Initialize
    Dim fd As FileData
    fd.Initialize
    fd.Dir = File.DirRootExternal
    fd.FileName = file_to_upload
    fd.KeyName = "files"
    fd.ContentType = "application/octet-stream"
    files.Add(fd)
    'Add second file
    'Dim fd As FileData
    'fd.Initialize
    'fd.Dir = File.DirAssets
    'fd.FileName = "1.png"
    'fd.KeyName = "upfile"
    'fd.ContentType = "application/octet-stream"
    'files.Add(fd)
    'Add name / values pairs (parameters)
    'Dim NV As Map
    'NV.Initialize
    'NV.Put("note1", "abc")
    'NV.Put("note2", "def")
    Dim req As HttpRequest
    req = MultipartPost.CreatePostRequest("http://www.xxxxx.com/upload.php", files)
    hc.Execute(req, 1)

if (!empty($_FILES["files"])) {
 
    $uploaded_file_name = $_FILES["files"]["name"];
    $uploaded_file = $_FILES["files"]["tmp_name"];

    // test if you got the file
    echo "the file uploaded was " . $upload_file_name;
    }

<?php
$target_dir = "uploads/";
$target_file = $target_dir . basename($_FILES["fileToUpload"]["name"]);
$uploadOk = 1;
$FileType = pathinfo($target_file,PATHINFO_EXTENSION);
// Check if image file is a actual image or fake image
if(isset($_POST["submit"])) {
    $check = getimagesize($_FILES["fileToUpload"]["tmp_name"]);
    if($check !== false) {
        echo "File is not a text file - <br>" . $check["mime"] . ".";
        $uploadOk = 0;
    } else {
        echo "File is  a text file.<br>";
        $uploadOk = 1;
    }
}

/*
// Check if file already exists
if (file_exists($target_file)) {
    echo "Sorry, file already exists.<br>";
    $uploadOk = 0;
}
*/
// Check file size
if ($_FILES["fileToUpload"]["size"] > 5000000) {
    echo "Sorry, your file is too large.";
    $uploadOk = 0;
}
// Allow certain file formats
if($FileType != "txt" && $FileType != "tab" && $FileType != "csv"
&& $FileType != "asc" ) {
    echo "Sorry, only txt, tab, csv and asc files are allowed.";
    $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 ". basename( $_FILES["fileToUpload"]["name"]). " has been uploaded.";
    } else {
        echo "Sorry, there was an error uploading your file.";
    }
}
?>

fd.KeyName = "files"

fd.KeyName = "fileToUpload"

 Dim NV As Map
    NV.Initialize
    NV.Put("uname", "mysuperduperusername")
    NV.Put("upass", "secret")