javascript - Can't pass PHP variables through JQUERY and insert them into MYSQL

I'm trying to send a form through jquery and it works fine sort of . When hitting the submit button my varibles:

$userid - got this variable from mysql and it's on top of my page (index.php)
$new_rand - generated this random number in file page_support. (support.php) 
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They are not proceded to the another file (page_jquery_new_ticket.php). Let me show you the code:

File: support.php

<div id="support">
<!-- START BACKGROUND SUPPORT -->
<div >
  <div >
    <div >
      <div >Pomoč i podrška</div>
      <div ><a href="?p=help">Pomoč</a></div>
      <div ><a href="?p=support">Podrška</a></div>
    </div>
  </div>
</div>
<!-- END OF BACKGROUND SUPPORT -->
<!-- MIDDLE INFORMATION FOR HELP STARTS HERE -->

<script>
$(document).ready(function(){
$('#new-ticket').on('submit',function(e) {

$.ajax({
url:'pages/jquery-pages/page_jquery_new_ticket.php',
data:$(this).serialize(),
type:'POST',
success:function(data){
console.log(data);
$("#success-creating-ticket").hide().html(data).fadeIn('slow');
}

});
e.preventDefault(); //=== To Avoid Page Refresh and Fire the Event "Click"===
});
});

</script>

<div id="success-creating-ticket">

</div>

<div >
    Prije nego što kontaktirate našu podršku molimo vas da pročitate sekciju „Pomoć“ gdje smo odgovorili na najčešća pitanja. U slučaju da vaše pitanje nije među njima pošaljite nam upit preko obrasca ispod i potrudićemo se da vam što prije pomognemo. 

    <br><br>
    <div >Podrška odgovara na vaša pitanja od ponedjeljka do petka između 10.00 i 16:00 sati</div> 
    <br>

    <?php 
      ///////////////////////////////////////////////////////////////////////
      // GET THE TICKET NUMBER IF ALREADY EXISTS CREATE NEW ONE 
      //////////////////////////////////////////////////////////////////////

      $statement = $dbConn->prepare("SELECT ticketnumber FROM tickets");
      $statement->execute();
      $view_ticket_number = $statement->fetch(PDO::FETCH_BOTH);

      $rndnumber = rand(1001, 2000);
      $randnr = $rndnumber.$user_id;

      if($view_ticket_number['ticketnumber'] == $randnr) 
        {
          $rndnumber = rand(1001, 2000);
          $new_rand = $rndnumber.$user_id;
          echo "<h1>#".$new_rand."</h1>";
        } else {
          $rndnumber = rand(1001, 2000);
          $new_rand = $rndnumber.$user_id;
          echo '<div >';
          echo $settings_ticket." #".$new_rand;
          echo '</div>';
        }

    ?>

    <br>

    <form method="post" action="" name="new-ticket" id="new-ticket">

    <input type="text" name="subject" placeholder="Napisite naslov">
    <br><br>
    <textarea name="message"  id="message" placeholder="Napisite vase pitanje ovdje"></textarea>
    <br><br>
    <input type="submit" name="send" value="<?php echo $settings_btn_send;?>" ><br><br>
  </form>





</div> 
<!-- END OF MIDDLE INFORMATIO STARTS HERE -->
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Here is the file: pages/jquery-pages/page_jquery_new_ticket.php

<?php  

////////////////////////////////////////////////////////////
// THIS FILE CREATES NEW TICKET
////////////////////////////////////////////////////////////

include_once "../../inc/settings.php";
include_once '../../db/dbc.php';
include '../../languages/lang_bosnian_mainpage.php';


if(isset($_POST['send']) == $settings_btn_send) 
    {
    $subject = mysql_real_escape_string($_POST['subject']);   //subject of the message
    $text = mysql_real_escape_string($_POST['message']);    //text in the message
    $tid = mysql_real_escape_string(date("Y-m-d"));       //time when the message was sent

    //check if subject is empty
      if(empty($subject)) { 
        echo '<div >';       
        echo 'Morate da napišete naslov';
        echo '</div><br>';
      } elseif(empty($text )) {
        echo '<div >';   
        echo 'Morate da opišete vaš problem';
        echo '</div><br>';
      } else {

        //INSERT THINGS INTO THE DATABASE
        $statement = $dbConn->prepare("INSERT INTO tickets (user_id, ticketnumber, subject, message, tickettime, status) VALUES (:user_id, :new_rand, :subject, :text, :tid, :settings_ticket_new)");
        $statement->execute(array(
            'user_id' => $user_id,
            'new_rand' => $new_rand,
            'subject' => $subject,
            'text' => $text,
            'tid' => $tid,
            'settings_ticket_new' => 'Novi'
        ));
        echo '<div >';
        echo 'Vaša poruka je poslana našoj podrsci. Uskoro ćemo odgovoriti na vaše pitanje';
        echo '<div>';
        //header("location: welcome.php?p=help");
      }


}


?> 
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When submitting in file (pages/jquery-pages/page_jquery_new_ticket.php) The variables $userid from my index.php are not recognized and also $new_rand is not eighter recognized. How can i transfer them when submitting the page so i can insert them into the database.

I hope you understand my question.

Cheerz