Question : How to use the switch function in PHP

What do I add to this code to return the phrase "Number 1"?

Thanks,
John 
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<?php
switch ($2)
{
case 1:
  echo "Number 1";
  break;
case 2:
  echo "Number 2";
  break;
case 3:
  echo "Number 3";
  break;
default:
  echo "No number between 1 and 3";
}
?>

Answer : How to use the switch function in PHP

please refer the updated code 
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<?php
$vardemo = "1";
switch ($vardemo)
{
case 1:
  echo "Number 1";
  break;
case 2:
  echo "Number 2";
  break;
case 3:
  echo "Number 3";
  break;
default:
  echo "No number between 1 and 3";
}
?>
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