Foreach and while loop not outputting my fetched data - php

Question

I have the following two prepared statements. The db connection and queries are correct, I have tested them within phpmyadmin. I also tested inside of my while fetch loop to see if I am pulling the data I am supposed to be and I am.
The problem resides in my while and foreach loops or possibly my num rows statement. I am not sure what I am doing incorrectly in there.
I am getting this error:
Warning: mysqli::query() expects parameter 1 to be string, object given
For this while loop:
while ($row2 = $result->fetch_assoc() ) {
I am also getting my else statement..
echo "<p>This topic does not exist.</p>";
Even though the info is echoing out correctly, again I just think my loops are wrong?
Does anyone see what I am doing wrong in my loops?
$con = new mysqli("localhost", "", "", "");
if (mysqli_connect_errno()) {
throw new Exception("Connect failed: %s\n", mysqli_connect_error());
exit();
}
/* activate reporting */
$driver = new mysqli_driver();
try {
$cid = $_GET['cid'];
$tid = $_GET['tid'];
$userid = ( isset( $_SESSION['user'] ) ? $_SESSION['user'] : "" );
echo $cid . "<br>";
echo $tid;
//Prepare
if ($stmt = $con->prepare("SELECT * FROM forum_topics WHERE `category_id`=? AND `id`=? LIMIT 1")) {
$stmt->bind_param("ii", $cid, $tid);
$stmt->execute();
$stmt->bind_result($topic_id, $category_id, $topic_title, $topic_creator, $topic_last_user, $topic_date, $topic_reply_date, $topic_views);
if (!$stmt) {
throw new Exception($con->error);
}
}
while ($row = $stmt->fetch()) {
$stmt->store_result();
$numrows = $stmt->num_rows;
echo $numrows;
}
if($numrows == 1){
echo "<table width='100%'>";
if ( $_SESSION['user'] ) {
echo "<tr><td colspan='2'><input type='submit' value='Add Reply' onclick=\"window.location =
'forum_post_reply.php?cid=".$cid."$tid=".$tid."'\"> <hr />";
} else {
echo "<tr><td colspan='2'><p>Please log in to add your reply</p><hr /></td></tr>";
}
}
foreach($stmt as $row) {
//Prepared SELECT stmt to get forum posts
if($stmt2 = $con->prepare("SELECT `id`, `category_id`, `topic_id`, `post_creator`, `post_content`, `post_date` FROM forum_posts WHERE `category_id`=? AND `topic_id`=?")) {
$stmt2->bind_param("ii", $cid, $tid);
$stmt2->execute();
$stmt2->bind_result($post_id, $post_category_id, $post_topic_id, $post_creator, $post_content, $post_date);
if (!$stmt2) {
throw new Exception($con->error);
}
}
}
if ($result = $con->query($stmt)) {
while ($row2 = $result->fetch_assoc() ) {
echo "<tr><td valign='top' style='border: 1px solid #000000;'>
<div style='min-height: 125px;'>".$row['topic_title']."<br />
by ".$row2['post_creator']." - " .$row2['post_date']. "<hr />" . $row2['post_content'] ."</div></td>
<td width='200' valign='top' align='center' style='border: 1px solid #000000;'>User Info Here!</td></tr>
<tr><td colspan='2'><hr /></td></tr>";
}
} else {
echo "<p>This topic does not exist.</p>";
}
}
catch (Exception $e)
{
echo "Error: " . $e->getMessage();
}

Answer 1

if you search on $stmt with ctrl-F in your browser (and ignoring $stmt2), you will notice that $stmt is a prepared statement all the way down to the error line. $stmt comes to life as a return type from prepare, is bound, and executed.
later on you:
if ($result = $con->query($stmt)) {
so $con->query() is expecting a string, not an object, no?
From the manual.
Not that there aren't other things to consider under a microscope, but I hope this narrowly answers the error message for you.
Edit:
Apparently, you cannot use bind_result with select *. Read the gents Accepted Answer to this question. He does 2 examples, 1 with 1 without select *. Also note store_result()
Here is the link to his answer that was upvoted quite a bit.