How to solve the problem of #else#?

This answer quotes ChatGPT

This code is the syntax of a template engine, and may need to be combined with the use of the template engine and related data to fully understand its meaning. However, if you want to directly subtract the fixed number 3 from the result of this code, you can do so by adding a mathematical operator to the code, as follows:

￥{#if $refrundstate ==1 && $refrundamount =="0.00"#}0{#else#}{#($staticmoney['business'] - 3)|string_format:"%.2f"#}{#/if#}

In the code above, we've subtracted 3 from the value of $staticmoney['business'], using parentheses to group this math operation with the subsequent string_format. Finally, the output of the code is formatted in string_format, leaving 2 decimal places.

$staticmoney['business']-3 or(parseInt($staticmoney['business'])-3)

Let's start with the code you gave us. This code is a statement from the Smarty template engine that prints the amount in the template. According to the logic in the code, if $refrundstate is equal to 1 and $refrundamount is equal to "0.00", then 0 is printed; Otherwise output $staticmoney['business'], which should be a floating-point number.
Then, by subtracting 3 from the output, you can wrap a Smarty mathematical operator around the output, like this :

{$staticmoney['business'] - 3}

This allows you to subtract 3 directly from the output.
Note that if $staticmoney['business'] is itself "0.00", then subtracting 3 will still output a negative number, and you may need to add some extra logic to avoid this.