parsing to $_POST dynamically

[r-it]

Hi guys, i am having a problem with $_POST. I am looking at parsing variables dynamically using post:

$txt = "txtBox";
for($i = 1; $i <= 5; $i++)
{
$txt .= "_".$i;
$var = $_POST[$txt];
echo $var;
}

the code i'm using is similar to the one above, but it does not ouptup anything, and i have tried inserting single quotes as well, please help

[trq]

foreach ($_POST as $k => $v) {
  if (substr($k, 0, 5) == 'txtBox') {
    echo $v;
  }
}

[dawsba]

<?
$txt = "txtBox";
for($i = 1; $i <= 5; $i++)
{
  $txt2 = $txt."_".$i;
  if(isset($_POST[$txt2])){$var = $_POST[$txt2];}else{unset($var);unset($txt2);}
  echo $var."<br />";
}
?>