ช่วยหน่อยครับ ต้องการเก็บค่าในตัวแปร json แต่เป็นลิงค์ใช้ในการส่งค่า

<?php
//fetch.php
$connect = mysqli_connect("localhost", "root", "1234", "ioonresort");
mysqli_set_charset($connect,"utf8");
$columns = array('BookingID', 'Ddate', 'CustomerName',  'StatusPay','DayST','bookingroomdetail');

$query = "SELECT * FROM bookingroom join customer using (CustomerID)  WHERE Ddate not in (select Ddate from bookingmeetingroom) and  ";

if($_POST["is_date_search"] == "yes")
{
 $query .= 'DayST BETWEEN "'.$_POST["start_date"].'" AND "'.$_POST["end_date"].'" AND ';
}

if(isset($_POST["search"]["value"]))
{
 $query .= '
  (BookingID LIKE "%'.$_POST["search"]["value"].'%"
  OR CustomerName LIKE "%'.$_POST["search"]["value"].'%"
  OR StatusPay LIKE "%'.$_POST["search"]["value"].'%"
  OR DayST LIKE "%'.$_POST["search"]["value"].'%")
 ';
}

if(isset($_POST["order"]))
{
 $query .= 'ORDER BY '.$columns[$_POST['order']['0']['column']].' '.$_POST['order']['0']['dir'].'
 ';
}
else
{
 $query .= 'ORDER BY BookingID DESC ';
}

$query1 = '';

if($_POST["length"] != -1)
{
 $query1 = 'LIMIT ' . $_POST['start'] . ', ' . $_POST['length'];
}

$number_filter_row = mysqli_num_rows(mysqli_query($connect, $query));

$result = mysqli_query($connect, $query . $query1);

$data = array();

while($row = mysqli_fetch_array($result))
{
 $sub_array = array();


 $sub_array[] = $row["BookingID"];
 $sub_array[] = $row["Ddate"];
 $sub_array[] = $row["CustomerName"]." ".$row['CustomerSurName'];
  $sub_array[] = $row["StatusPay"];
 $sub_array[] = $row["DayST"];
 $sub_array[] = htmlentities("<a href='detailbookingmeeting.php?datebook=" echo $row["BookingID"] ;'>รายละเอียด"');
$sub_array[] = $row["DayST"];
$sub_array[] = $row["StatusPay"];

 $data[] = $sub_array;
}

function get_all_data($connect)
{
 $query = "SELECT * FROM bookingroom join customer using (CustomerID)  WHERE Ddate not in (select Ddate from bookingmeetingroom)";
 $result = mysqli_query($connect, $query);
 return mysqli_num_rows($result);
}

$output = array(
 "draw"    => intval($_POST["draw"]),
 "recordsTotal"  =>  get_all_data($connect),
 "recordsFiltered" => $number_filter_row,
 "data"    => $data
);

echo json_encode($output);

?>

$sub_array[] = '<a href="detailbookingmeeting.php?datebook="'echo $row["BookingID"];'>รายละเอียด';

$sub_array[] = '<a href="detailbookingmeeting.php?datebook='.$row["BookingID"];'">รายละเอียด';

$sub_array[] = '<a href="detailbookingmeeting.php?datebook='.$row["BookingID"];'"> รายละเอียด </a>';

 $sub_array[] = '<a href="detailbookingmeeting.php?datebook='.$row["BookingID"];'"> <font color="red"> รายละเอียด </font> </a>';

$sub_array[] = '<a href="detailbookingmeeting.php?datebook='.$row["BookingID"].'"><font color="red"> รายละเอียด </font></a>';