如何定义变量并在smarty中回显它们？

I've added this code into a Smarty template file:

$totalearnings = {$pendingcommissions|replace:' USD':''|replace:'$':''} + {$balance|replace:' USD':''|replace:'$':''} + {$withdrawn|replace:' USD':''|replace:'$':''};
echo $totalearnings;

This is how it's displaying on the page:

$totalearnings = 0.00 + 1010.00 + 2000.00;
echo $totalearnings;

What exactly do I need to change to make this code work? $totalearnings should be adding the numbers instead of just displaying the equation on the page...

Try this using {assign var="name" value="Bob"}

{assign var="p" value=$pendingcommissions|replace:' USD':''|replace:'$':'' }

{assign var="b" value=$balance|replace:' USD':''|replace:'$':'' }

{assign var="w" value=$withdrawn|replace:' USD':''|replace:'$':'' }

{assign var="totalearnings" value=0}

{assign var="totalearnings" value=$totalearnings+$p+$b+$w}

{$totalearnings}

{assign}