像这样改变你的 echo 语句，

Change your echo statement like this,

echo '<center><img src="admin/gallery/'.{$_FILES['userfile']['name']}.'" width="100" height="100"/>'.'</center>';

还有你的 if 检查显示不正确.

Also your if checks showing incorrectly.

可能是这样的，

if(move_uploaded_file($_FILES['userfile']['tmp_name'],"C:/xampp/htdocs/new/admin/gallery/{$_FILES['userfile']['name']")
{
 .....
}