如何为每个提取行添加自动编号?

how do i add auto numbering with each fetching row ? i want auto add new number as serial number with each fetching rows from mysql databse?

<?php
$i=0;
$query=mysql_query("SELECT * FROM cart
WHERE email='".$_SESSION['email']."'");

while($rowdata1=mysql_fetch_array($query))
$i++;
{
?>

<?php echo $i ?> // here i want to add serial number
<?php echo $rowdata1['itemcode']?>
<?php echo $rowdata1['product']?>
<img src="admin/<?php echo $rowdata1['image'] ?>"/>
<?php echo $rowdata1['price']?>
<?php echo $rowdata1['size']?></font>
<?php echo $rowdata1['total']?>
<?php echo $rowdata1['date']?>
<?php $rowdata1['blueexnum']?>
<?php echo $rowdata1['blueexstatus']?>
<?php }?>                   

problem is solved now thanks

<?php
$i=0;
$query=mysql_query("SELECT * FROM cart
WHERE email='".$_SESSION['email']."'");
while($rowdata1=mysql_fetch_array($query))
{
$i++;
?>

You're almost there, change your code to:

$h = '';
$i = 0;
while($rowdata1=mysql_fetch_array($query)) {
    $i++;
    $h .= "$i) $rowdata1[itemcode] $rowdata1[product] ";
    $h .= "<img src=\"admin/$rowdata1[image]\"/> ";
    $h .= "$rowdata1[price] $rowdata1[size] $rowdata1[total] ";
    $h .= "$rowdata1[date] $rowdata1[blueexnum] $rowdata1[blueexstatus]<br />";
}
echo $h;

Of course, you can use echo as you did in your code. It's usually faster though to build the whole string in $hand echo it out as a whole.
You might want to use a <table> to display the data in a more structured way.

Use mysql to do that for you. Change your query to

SET @row_number=0;
SELECT @row_number:=@row_number+1 AS row_number, cart.*
FROM cart
WHERE email=?"

Then when you use it, just echo as just another column

<?php echo $rowdata1['row_number']?>

On a side note, don't use $_SESSION['email'] without escaping it.

<?php>
    //set counter to 1
    $counter = 1;
    <thead>
    <tr>
    th>No.</th>
    <th>REGISTRATION #</th>
    <th>SURNAME<`enter code here`/th>
    </tr>
    <tr>
    <td><?php echo $counter; ?></td>
    <td><?php echo htmlentities($class['registration']); ?></td>
    <td><?php echo htmlentities($class['sirname']); ?></td>
    </tr>
    $counter++;
    </tbody>

?>