Update MySQL PHP

<?php
 
$host="localhost";
$username="asaadadasdd";
$password="adsdfagdfag";
$db_name="sagsdfagsfags_base";
$tbl_name="gasfafsdafdsaf_tabla"; XD
 
 
mysql_connect("$host", "$username", "$password")or die("cannot connect");
mysql_select_db("$db_name")or die("cannot select DB");
 
$sql="SELECT * FROM $tbl_name order by ID_Aviso desc limit 100";
$result=mysql_query($sql);
 
$count=mysql_num_rows($result);
?>
<form name="form1" method="post" action="">
<table width="1000" border="0" cellspacing="1" cellpadding="0">
<tr>
<td align="center"><strong>Id</strong></td>
<td align="center"><strong>Name</strong></td>
<td align="center"><strong>Lastname</strong></td>
<td align="center"><strong>Email</strong></td>
</tr>
 
<?php
while($rows=mysql_fetch_array($result)){
?>
 
<tr>
<td align="center">
<? $ID_Aviso[]=$rows['ID_Aviso']; ?><? echo $rows['ID_Aviso']; ?>
</td>
<td align="center">
<input name="texto[<? echo $rows ['ID_Aviso'] ?>]" type="text" id="texto" value="<? echo $rows['texto']; ?>" size="100">
<!-- ESTO ERA ASÍ ORIGINALMENTE <input name="texto[]" type="text" id="texto" value="<? echo $rows['texto']; ?>" size="100"> -->
</td>
<td align="center">
<input name="telefono[<?  echo $rows ['ID_Aviso'] ?>]" type="text" id="lastname" value="<? echo $rows['telefono']; ?>">
</td>
<td align="center">
<input name="edicion_numero[<?  echo $rows ['ID_Aviso'] ?>]" type="text" id="edicion_numero" value="<? echo $rows['edicion_numero']; ?>">
</td>
</tr>
 
<?php
 
}
?>
 
<tr>
<td colspan="4" align="center"><input type="submit" name="Submit" value="Submit"></td>
</tr>
</table>
</form>
 
<?php
 
if($Submit){
for($i=0;$i<$count;$i++){
$sql1="UPDATE $nqn_avisos SET texto='$texto[$i]', telefono='$telefono[$i]', edicion_numero='$edicion_numero[$i]' WHERE ID_Aviso='$ID_Aviso[$i]'";
$result1=mysql_query($sql1);
}
}
 
if($result1){
header("location:edit.php");
}
mysql_close();
?>