Запрос по выбранной ссылке

<?php
$result_mail4 = mysqli_query($connection, "SELECT * FROM `Application` ORDER BY `ID_Application` DESC");
while($object4 = mysqli_fetch_assoc($result_mail4))
    {
?>
         <a href ="/modify.php"> Заявка № <?php echo $object4['ID_Application'];?> На <?php echo $object4['Date_event'];?> </a> 
             <br> 
<?php
        }
?>

<?php
$result_mail4 = mysqli_query($connection, "SELECT * FROM `Application` ORDER BY `ID_Application` DESC");
while($object4 = mysqli_fetch_assoc($result_mail4))
    {
?>
         <a href ="/modify.php?id=<?php echo $object4['ID_Application']; ?>"> Заявка № <?php echo $object4['ID_Application'];?> На <?php echo $object4['Date_event'];?> </a> 
             <br> 
<?php
        }
?>

$_GET['id']

<?php
$result_mail4 = mysqli_query($connection, "SELECT * FROM `Application` WHERE `ID_Application` = ".intval($_GET['id']));
while($object4 = mysqli_fetch_assoc($result_mail4))
    {
?>
         <a href ="/modify.php?id=<?php echo $object4['ID_Application']; ?>"> Заявка № <?php echo $object4['ID_Application'];?> На <?php echo $object4['Date_event'];?> </a> 
             <br> 
<?php
        }
?>

<?php
$result_mail4 = mysqli_query($connection, "SELECT * FROM `Application`  ORDER BY `Date_event` DESC");
while($object4 = mysqli_fetch_assoc($result_mail4))
    {   
            $sum = strftime("%W", strtotime($object4['Date_event']));
        print_r($sum); 
?>          
<a href ="/week_plan.php"?id=<?php echo $object4['ID_Application']; ?>"> Недельный план  <?php echo $object4['Date_event'];?> - <?php echo $object4['Date_event'];?> </a> <br> <br>
<?php
    }
?>