php_pdo在使用mysql存储过程结果出错

[kuaiying001]

我的存储过程
create procedure newComm(in t int, in topicLis varchar(250))
begin
set @a = CONCAT('select tid,topicid,content,uid,date from comments where topicid in (', topicLis , ') and date >=', t);
prepare stmt1 from @a;
execute stmt1;
deallocate prepare stmt1;
end;

表
CREATE TABLE `comments` (
`tid` bigint(20) NOT NULL auto_increment,
`topicid` bigint(20) NOT NULL,
`uid` bigint(20) NOT NULL,
`date` int(11) default NULL,
`content` varchar(288) default NULL,
PRIMARY KEY (`tid`)
)

情况：
1.在windows下,无论是在mysql黑窗口，还是在php里面执行，结果均正常；
2.在linux下，在mysql黑窗口里面执行， 结果正常；
3.在linux下，在php里面执行，结果出错。详情情况如下（预期：这两个结果应该一样）

在php里面直接使用mysql语句查询的（select tid,topicid,content,uid,date from comments where topicid in (', topicLis , ') and date >=', t）
Array(
[0] => Array
(
[tid] => 304
[topicid] => 1249
[content] => 漂亮哦
[uid] => 137
[date] => 1308382195
[name] => daxi
[sex] => 0
[headImg] => 0
[imgtype] => jpg
)

)

在php里面，调用存储过程得到的结果
Array
(
[0] => Array
(
[tid] => -4389820840436235212
[topicid] => -6574241152680279386
[content] =>
[uid] =>
[date] => -1362969918
[name] => �“¦137
1308382195daxi00jpg�jpg�e from comments left join user on uid=id where topicid in (1249) and date >=0;�'
�
�
[sex] => 119
[headImg] => 49
[imgtype] =>
���
)

)

求指点分析，或是告知分析方向