elementary str_pad question

Hi

I have looked at the manula for above code but for the life of me can't figure out why it doesn't do what i should.
I am trying to input name of a field, - , first time round; -- (2nd time round), ---(3rd time round ) etc. etc.





<?php
$x=1;
$str = "-";
while ($row = mysql_fetch_array($result))
{

?>
<input type="hidden" size="30" name="Qty<?php echo".$x";?>" value="<?php

echo $row["qty"];

?>" >


<input type="hidden" size="30" name="Part Number<?php echo".$x";?>" value="<?php

echo $row["part_number"];


?>" >



<input type="hidden" size="30" name="Price Each<?php echo".$x";?>" value="<?php

echo "£".$row["price_each"];



?>" >


<input type="hidden" size="30" name="<?php



echo str_pad($str,$x,'-');



?>" value =" 222">

<?php
echo str_pad($str, $x, '-', STR_PAD_RIGHT);

echo $x;
$x=$x+1;

}
?>

p.s I am very new to php.
thanking you in advance