Mysqli_insert_id Not working

I'm trying to get the last autoincrement id from an INSERT / UPDATE query, I try this way, but it doesn't work, it just echoes id=0

every time.

PHP

require_once('conn.php'); 
$temp = 'temp';

$query = "INSERT INTO temp (temp) VALUES('$temp')";
$result = mysqli_query($conn, $query) or trigger_error(mysqli_error($conn), E_USER_ERROR);

$id = mysqli_insert_id($conn);
echo 'id = '.$id;

      

        
        
        
      

    

Please take a look and suggest any possible way to do this.