PHP Get variable to equal value of switch

I am trying to get a variable on my page to equal the result of a switch I have.

This is the code:

$payment_method = switch ($cardtype) {
case "visa" : echo "VSA"; break;
case "mastercard" : echo "MSC"; break;
case "maestro" : echo "MAE"; break;
case "amex" : echo "AMX" ; break;
default : echo "Please specify a payment method!"; break;
};

How can I get $payment_method to equal the result of this????

So far I recieve an error:

Parse error: syntax error, unexpected T_SWITCH in /var/www/account/credits/moneybookers/process.php on line 65

I am trying to get a variable on my page to equal the result of a php switch I have.

This is the code:

$payment_method = switch ($cardtype) {
case "visa" : echo "VSA"; break;
case "mastercard" : echo "MSC"; break;
case "maestro" : echo "MAE"; break;
case "amex" : echo "AMX" ; break;
default : echo "Please specify a payment method!"; break;
};

How can I get $payment_method to equal the result of this????

So far I recieve an error:

Parse error: syntax error, unexpected T_SWITCH in /var/www/account/credits/moneybookers/process.php on line 65

Original Question by: user342391