Mini Shell

<?php 
 
    include '../db/database.php';
    include 'function_editdate.php';
    $historycrownID = $_POST['id'];
    
    $sql = "SELECT * FROM history_crown AS t1 LEFT JOIN crown AS t2 ON (t1.crownID = t2.crownID)      
                 WHERE (`historycrownID`='$historycrownID') ";   
   $result = mysqli_query($link, $sql);   
  while($row = mysqli_fetch_array($result)){
  
   $rowdate = $row['date'];
   $rowdate1 = mydatesql($rowdate);
  
   $arr[] = array(
            "historycrownID"=>$row['historycrownID'],
            "teachercrID"=>$row['teachercrID'],
            "crownID"=>$row['crownID'],
            "year"=>$row['year'],
            "date"=>$rowdate1
           );
       }
           
   $json = json_encode($arr[0]);
   echo $json;

   ?>