{easy} Help with form and switch's

Im lost. oober new to php and i cannot seem to get this to work. Trying to get a user to choose between 3 players. and then for the page to print out who the user picked. It only seems to pick player 1 no matter what radio button i choose. I think i has something to do with the action in the form. help is appriciated

<?
$chooseaplayer=$_POST[chooseaplayer];



if(isset($_POST[chooseaplayer])) {


switch ($playerchosen)
{
case $player1:

print "you have chosen player 1";
break;

case $player2:

print "you have chosen player 2";
break;

case $player3:
print "you have chosen player 3";
break;

default:
print "Some error";
break;

       }

}


print "


<form method='POST' action='$playerchosen'>
<input type='radio' name='player1' value='$player1'> player 1
<br>
<input type='radio' name='player2' value='$player'2> player 2
<br>
<input type='radio' name='player3' value='$player3'> player 3
<br>
<input type=submit name=chooseaplayer value=Choose>
</form> "


?>

PHP:

 

after reading my book i bought i realized there was an easier way. thanks. fixed it myself