如何将变量分组到一行中

I'm trying to store all the file’s name in just one row after upload them

$tmp_name = $_FILES["Filedata"]["tmp_name"][$key];
$name = $_FILES["Filedata"]["name"][$key];
$ext = substr(strrchr($name, '.'), 1);

when I echo this variable

$thelist .= $name.',';
echo $thelist

result. image1,image2,image3,

but in Mysql table the result is each one in diferent row and col.

image1,,,
image1,image2,
image1,image2,image3,

I just need all in one row in one col. like

image1,image2,image3,