@BFOlmaz; buyrun hocam
<?php
$secili_urun_ID = 5; # Bu kısmı değiştirin.
$sorgu = mysql_query("SELECT * FROM `urunler` ORDER BY `urun_id` ASC");
while($urun = mysql_fetch_assoc($sorgu)):
?><label class="urunu1sec">
<span class="radio">
<input
type="radio" id="radio" name="urun" value="<?=$urun["urun_id"];?>"
<?=$secili_urun_ID == $urun["urun_id"] ? "checked=\"checked\"" : "";?>
/>
</span>
<span class="yazi">
<?=$urun["urun_isim"];?>
</span>
<span class="fiyat">
<b><?=$urun["urun_tutar"];?></b>TL
</span>
<div class="clear"></div>
</label><?php endwhile; ?>