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循环中间加入字符的有关问题

WBOY
WBOYOriginal
2016-06-13 12:38:26763browse

循环中间加入字符的问题
我从数据库中去读
while ($down=mysql_fetch_array($downser)){     

$kb_data_glay.= $down[goods_sn].'$'.$down[goods_name];

}

数据两条以上时中间需要加入‘,’如果直接写

$kb_data_glay.= $down[goods_sn].'$'.$down[goods_name]."','";

这样最后一条又多了一个 怎么写才能避免?

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