php - fetch single parent id and all child id -


i want fetch user creator id (ex: parent id) , child id on same level. there fetch upper level , lower level id. problem seems in sql query.

<?php       include('config.php');     $user_level_up=$_session["level"];     $user_level_down=$_session["level"];     $user_id = $_session['id'];     $user_level_up+=1;     $user_level_down-=1;     $sql = "select * users  level = '$user_level_up' or              level='$user_level_down'";      $result = mysqli_query($conn , "$sql");     if(mysqli_num_rows($result) > 0 )     {     while( $row=mysqli_fetch_array($result))      {       // preparing array      ?>     <option value="<?php echo $row['id']; ?>"><?php echo $row["username"]. "     (".$row["email"].")"."(".$row["id"]. ")" . "(" . $row['level'] . ")" . "(" .      $row['create_user_id'] . ")" ; ?></option>    <?php  }    } ?>

use query this

$sql = "select * users  level = '".$user_level_up."' or          level='".$user_level_down."'";

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