Temizlenmiş hâli:
<?php 

include(dirname(__FILE__) . '/setting/setting_general.php'); 

$tag= mysql_query("
	SELECT *
	FROM tbl_firmalar
	WHERE yayinid = 1
	ORDER BY id DESC
	LIMIT 0, 20"); 
$tag2 = $tag_get['firma_adi']; 
while($tag_get = mysql_fetch_assoc($tag))
{ 
	echo '<span class="diger" title="', $tag_get['firma_adi'], '">', $tag_get'firma_adi'], '</span>'; 
	echo $tag; 
}
mysql_free_result($tag);

mysql_close(); 

?>