Couldn't fetch mysqli - php

Question

before you send me thousand of links to the problem of other please read my code. i googled my problem for about an hour and tried every suggestion i could find. I got a similar code example from php book but its not working on my local server.
my code:
$mysqli = new mysqli("localhost", "root", "", "poi_site");
if ($mysqli->connect_error){
echo "something went wrong!".mysqli_connect_error();
exit();
}
echo "db connection is stable";
$mysqli->close();
$result = $mysqli->query("SELECT name FROM cities;");
while($row = $result->fetch_array()) {
echo " {$row['name']}";
}
$result->close();
i already tried to get a error output and that showed me that "result" is null, like i expexted the problem from the other people.
my errors at the moment are:
Warning: mysqli::query(): Couldn't fetch mysqli in ...
Fatal error: Call to a member function fetch_array() on a non-object in ...
dont know how to solve the problem. thanks
EDIT: sorry i had a typo in the code here, it was right on my code!

Answer 1

A wrong ";" after cities in here:
$result = $mysqli->query("SELECT name FROM cities;");
$result = $mysqli->query("SELECT name FROM cities");
This has to be $result instead of $ergebnis
while($row = $ergebnis->fetch_array()) {
while($row = $result->fetch_array()) {
U don't need "{" and "}" after and before the $row statement here:
echo " $row['name']";
echo " $row['name']";
Your closing the database, before the query here:
echo "db connection is stable";
$mysqli->close();
Delete this line!

Answer 2

Try to change this code
$result = $mysqli->query("SELECT name FROM cities;");
while($row = $ergebnis->fetch_array()) {
echo " {$row['name']}";
}
with this one and check if also you haven't result
$result = $mysqli_query($conn,"SELECT name FROM cities");
while($row = mysqli_fetch_array($result)) {
echo " {$row['name']}";
}

Answer 3

while($row = $ergebnis->fetch_array()) {
to
while($row = $result->fetch_array()) {
check the very first example here
http://us2.php.net/manual/en/mysqli-result.fetch-array.php
UPDATE :
$mysqli->close();
is done prior to fetch so this should be the last line of your code after u have done with all the operations are done.