Mini Shell

<?php

include '../db/database.php';

$sql = "SELECT * FROM teacher AS t1 INNER JOIN title_name AS t2 ON (t1.titleID = t2.titleID)      
       LEFT JOIN  train AS t3   ON (t1.teacherID = t3.teachertrID ) WHERE status_user = 1 or status_user = 2 or status_user = 3
        group by teacherID order By teachertrID desc ";
        

$result = mysqli_query($link, $sql);

$trainArray = array();
while ($row = mysqli_fetch_assoc($result)) {
    $trainArray[] = $row;
}
echo json_encode($trainArray);