我正在使用 PDO 从 MySQL 中提取评论,显示的评论限制为 2 条,但查询不会检索评论,我也不能 var_dump print_r,因为它确实打印了任何内容。我认为这应该是查询本身的问题,认为它已经无数小时没有工作,所以我想我会问更有经验的程序员。
没有数据输出到页面上,我不确定是 second_count 变量还是 post_iD 变量的问题。
1.我是否正确使用了while循环?
2. 用while循环好还是foreach好?
3. var_dump 和 print_r 函数是否由于查询或 PHP.INI 中的错误而不起作用?
这是我使用 PDO 提取数据的方式。
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;
}
}
}
这就是我试图在我的页面上显示信息的方式,
<?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; ?>">
<a href="#" class="view_comments" id="<?php echo $post_iD; ?>">View all<?php echo $comment_count; ?> comments</a>
</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"><a href='' title='<?php echo $time;?>' class="timeposted"><?php echo $mtime;?> — Like</a></div>
</div>
<?php
}
}
?>