$yazi = mb_substr($yaz['yazi_metni'],0,300,'UTF-8');
<table width="775" align="right" border="0">
<tr>
<td>
<?php
include ("vt.php");
$sor=mysql_query("select * from yazilar ORDER BY id DESC");
while($yaz=mysql_fetch_array($sor)){
$baslik=$yaz['baslik'];
$yazi= mb_substr($yaz['yazi_metni'],0,300,'UTF-8');
echo "<tr>
<td><a href=makaleoku.php?id=$id>$baslik</a></td>
<td>$yazi</td>
";
}
echo '
</tr>
</table>';
?>+++ işini görecektir.