Form data empty while sending file along with other data

Question

Hi All I am trying to send a form data along with file but form data is always empty and unable to upload a file

here is my html

    <form class="form-class" id="userjob_form" enctype="multipart/form-data">
        <div class="form_button">Name</div>
        <input type="text" name="username" id="user_name" class="form_button" required>
        <br>
        <div class="form_button form_button_margin">Email</div>
        <input type="email" name="usermail" id="user_mail" class="form_button" required>
        <div class="form_button form_button_margin">Phone Number</div>
        <input type="number" name="userphone" id="user_phone" class="form_button" required="" max-length="10" pattern="[0-9]{10}" title="Enter a valid phone number.">
        <div class="form_button_margin">Resume</div>
        <input type="file" name="resume" id="upload_file" class="" required>
        <input type="submit" value="SUBMIT" id ="fill-jobform" class="form_button_margin-2"/>
    </form>

and ajax which send formdata to php is as

$('#userjob_form').on('submit', function(e) {
                        //var job_id = $('fieldset').attr('id');

                            e.preventDefault();
                            //alert($('#upload_file')[0].files[0]);
                            var fd = new FormData(this);
                            fd.append('resume', $('#upload_file')[0].files[0]);
                            fd.append("user_name", $('#user_name').val());
                            fd.append("user_name", $('#user_name').val());
                            fd.append("candidate_email", $('#user_mail').val());
                            fd.append("candidate_phone", $('#user_phone').val());
                            console.log(fd);
                var file_name = $('input[type=file]')[0].files[0].name.split(' ').join('-');
    var ext = file_name.split('.').pop();
                        if(ext == "txt" || ext == "html" || ext == "htm" || ext == "doc" || ext == "docx" || ext == "pdf" || ext == "rtf"){
                            //$('.submitting').show();
                            $.ajax({ 
                                    url: 'data/formprocessing.php',
                                    method: 'POST',
                                    dataType:'JSON',
                                    data: fd,
                                    processData: false,  // tell jQuery not to process the data
                                    contentType: false,
                                    success: function(data) {

                                        alert(data);

                                    }

            });
                        }else{
                            alert('wrong format');
                        }
});

and php file which is used to uplaod that document in pds folder

 <?php
header("Content-Type: text/javascript; charset=utf-8");
$username = "root";
$password = '';
$hostname = "localhost"; 

//connection to the database
$dbhandle = mysql_connect($hostname, $username, $password) 
 or die("Unable to connect to MySQL");

//select a database to work with
$selected = mysql_select_db("rr",$dbhandle) 
  or die("Could not select examples");


if(!isset($_FILES['resume'][['name']])) {
    echo $response_array['status'] = 'success1';
}
else {
    // Validate uploaded file
    $fileName = $_FILES['resume']['name']; // file name
    $fileExt = substr($fileName, strrpos($fileName, '.') + 1); // file extension
    $fileSize = $_FILES['resume']['size']/1024; // size in KBs
    $filePath = $_FILES['resume']['tmp_path']; // file path
    $id = $_POST['username'];
    $username = $_POST['useremail']['name'];
    $profileImg = $_POST['userphone']['name'];
    $displayImg = $_FILES['resume']['name'];
            move_uploaded_file($_FILES['resume']['tmp_path'],
              "pds/" . time().'-' . $_FILES['resume']['name']);
              echo $response_array['status'] = 'success2';
    }
?>

pds is a folder lies where is this php file but I am unable to uplaod file any help please I am stuck in this problem for last day