不能将mysqli_result类型的对象用作数组是什么意思？

Question

I am trying to find the last teacher id from my database and getting this error. Fatal error: Cannot use object of type mysqli_result as array in .My Codes are as follows. Any Help ?

class tinyteacher {
public function getLastTeacherId(){
  $query = ("SELECT `teacherid` FROM `teacher` ORDER BY `teacherid` DESC ");
  $result = $this->db->select($query);
  return $result;
 }
}

<div class="col-sm-6">
  <input type="text" name="teacherid" value="
  <?php 
    $teacher = new tinyteacher();
    $lastteacher = $teacher->getLastTeacherId();
   echo $lastteacher;   
  ?> 
</div>

Answer 1

your function return $result; array object function return $result; array object

and you print array object in echo echo use for print string not for array

so use print_r instead of echo

like print_r($lastteacher);

Answer 2

Can't use object of type mysqli_result as array

Use mysqli_fetch_assoc or mysqli_fetch_array to fetch a result row as an associative array.

$query = "SELECT 1";
$result = $mysqli->query($query);
$data_array = $result->fetch_assoc()

and for more reference click here