if else condition 'else' is not working - php

Question

/MY CODE/
The if part is working properly but else is not working.
i even tried $variable instead of direct echo but still it is not working 'else'
Updated
<?php
$db = new mysqli('localhost', 'root' ,'', 'timeline');
if(!$db) {
echo 'Could not connect to the database.';
} else {
if(isset($_POST['queryString'])) {
$queryString = $db->real_escape_string($_POST['queryString']);
if(strlen($queryString) >0) {
$query = $db->query("SELECT collegename FROM college WHERE collegename LIKE '$queryString%' LIMIT 10");
if(isset($query)) {
echo '<ul>';
while ($result = $query ->fetch_object()) {
echo '<li onClick="fill(\''.addslashes($result->collegename).'\');">'.$result->collegename.'</li>';
}
echo '</ul>';
} else {
echo 'create some'; // this part is not working
}
} else {
// do nothing
}
} else {
echo 'There should be no direct access to this script!';
}
}
?>
help me out.....
even read lots of like problem on stackoverflow but no real return

Answer 1

If you are using mysqli::query then your if(isset($query)) statement will always be evaluated as true, as $query would be either FALSE or a mysqli_result object. isset returns TRUE for both these values, so your else code will never be called.
Documentation on isset:
Returns TRUE if var exists and has value other than NULL, FALSE otherwise.
Use if($query !== false) instead.
Update
It also seems like you are checking $query to see whether or not there was a hit in the database. You need to check the number of rows in the result for that, e.g:
if ($query !== false && $query->num_rows > 0) {
// Query was ok and at least one row was returned
}
else {
// Will be reached if query was bad or there were no hits
}

Answer 2

Try
if($query_run = $db->query("SELECT collegename FROM college WHERE collegename LIKE '$queryString%' LIMIT 10")){
echo '<ul>';
while ($result = $query ->fetch_object()) {
echo '<li onClick="fill(\''.addslashes($result->collegename).'\');">'.$result->collegename.'</li>';
}
echo '</ul>';
} else {
echo 'create some';
}