<?
//從1到10加總

$num = 10;
$i = 1;

while ($i<=$num){ 

    $a = $a+$i;
    $i++;

}
    echo $a;
?>

<?
//從1到10加總

$num = 1;
$i = 10;

while ($i>=$num){ 

    $a = $a+$i;
    $i--;

}
    echo $a;
?>