Comments not displaying when called from Database inside While Loop - php

Question

I'm pulling comments from MySQL with PDO with a limit of 2 comments to show, yet the query does not retrieve the comments nor can I var_dump neither print_r since it does print anything. I believe it should be an issue with the query itself, thought it hasn't worked for countless hours so I figured I'd ask more experienced programmers.
There is no data outputted onto the page, I'm unsure whether It's an issue with the second_count variable or the post_iD variable.
1. Am I using the while loop correctly?
2. Better to use while loop or foreach?
3. Does var_dump and print_r function not work due to errors in the
query or in PHP.INI from what it seems?
Here is how I'm pulling the data with PDO.
PUBLIC FUNCTION Comments( $post_iD,$second_count ){
if($second_count){
$sth = $this->db->prepare("
SELECT C.com_id, C.uid_fk, C.comment, C.created, U.username, U.photo
FROM comments C, users U
WHERE U.status = '1'
AND C.uid_fk = U.uiD
AND C.msg_id_fk = :postiD
ORDER BY C.com_id ASC LIMIT :second, 2");
$sth->execute(array(':postiD' => $post_iD, ':second' => $second_count));
while( $row = $sth->fetchAll())
$data[] = $row;
if(!empty($data)){
return $data;
}
}
}
And here is how I'm trying to display the information on my page,
<?php
$commentsarray = $Wall->Comments( $post_iD, 0 );
$x=1;
if($x){
$comment_count = count($commentsarray);
$second_count = $comment_count-2;
if($comment_count>2){
?>
<div class="comment_ui" id="view<?php echo $post_iD; ?>">
View all<?php echo $comment_count; ?> comments
</div>
<?php
$commentsarray = $Wall->Comments( $post_iD, $second_count );
}
}
if( $commentsarray ){
foreach($commentsarray as $data){
$com_id = $data['com_id'];
$comment = tolink(htmlcode($data['comment'] ));
$time = $data['created'];
$mtime = date("g:i", $time);
$username = $data['username'];
$com_uid = $data['uid_fk'];
$photo = $data['photo'];
?>
<div class="stcommentbody" id="stcommentbody<?php echo $com_id; ?>">
<div class="stcommentimg">
<img src="<?php echo $photo;?>" class="small_face">
</div>
<div class="stcommenttext">
<?php if($uiD == $com_uid || $uiD == $post_iD ){ ?>
<a class="stcommentdelete" href="#" id="<?php echo $com_id;?>" title="Delete Comment"></a>
<?php } ?>
<div class="stmessage"><?php echo clear($comment); ?></div>
</div>
<div class="stime"><?php echo $mtime;?> — Like</div>
</div>
<?php
}
}
?>

Answer 1

1.Simply like this:
$data = $sth->fetchAll();
if(!empty($data) AND count($data) > 0){
return $data;
}
You don't need while to work with fetchAll.
2.I'ts better to use Exception in every your query then you can see if there is any error.
e.g
try
{
//your PDO stuffs here
}
catch (PDOException $e)
{
echo $e->getMessage();
}