Apache+PHP HTML form problem

I am running Apache/2.0.54 (Win32) PHP/4.3.11
and having problem with form posting

on a form I check multiple checkboxes, browser submits all 3 'Save' values (see tcp dump)
but php sees only last one how come ?
is there setting in Apache or php I missed ?

<?php
echo "<form action='test.php' method='post'>
<input type='checkbox' name='Save' value='1'>
<input type='checkbox' name='Save' value='2'>
<input type='checkbox' name='Save' value='3'>
<input type='image' name='do' value='update' src='/img/1.gif'>
</form>";

foreach ($_POST as $varName => $varValue)
{
echo $varName."=".$varValue."<br>";
}
?>

===========================
Output
---------------------------
Save=3
do_x=15
do_y=10
do=update

===========================
TCP DUMP
---------------------------
Content-Type: application/x-www-form-urlencoded
Content-Length: 45

Save=1&Save=2&Save=3&do.x=11&do.y=9&do=update
===========================

 

 

 

 

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