PHP encountered an error call to a member function Fetch_object ()

1. Check the grammar, no problem

<?php
Require "fun.php";
$KC _sql= "SELECT distinct KCM from KCB";//Find course Name
$conn = new mysqli (' localhost ', ' root ', ' ', ' PXSCJ2 ');
$KC _result=mysqli_query ($conn, $KC _sql); * Select queries return a resultset */
Var_dump ($KC _result);
while ($KC _row= $kc _result->fetch_array (MYSQLI_ASSOC))//* Fetch array */
{
echo "<option>". $kc _row[' KCM '). " </option> "; Export course name to drop-down box
}
?>

2. Using Var_dump output, no results

Var_dump ($KC _result);

3. Search directly in Mysqladmin, results

Select distinct KCM from KCB "

Prompt error, check found field name is Chinese, change to English, on it.

PHP encountered an error call to a member function Fetch_object ()