function calculate price price2 price3 echo you can then call..., PHP Language Syntax, PHP

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Question:function calculate($price, $price2="", $price3="")
{
  echo $price + $price2 + $price3;
}
You can then call calculate(), passing along just $price and $price3, like so:
calculate(10, "", 3);
This returns the following value:

A 13 
B 10, "", 3 
C 10,00, 3 
D 10null3

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Question:function calculate($price, $price2="", $price3="") { echo $price + $price2 + $price3; } You can then call calculate(), passing along just $price and $price3, like so: calculate(10, "", 3); This returns the following value:

A 13

B 10, "", 3

C 10,00, 3

D 10null3

A

Question:
function calculate($price, $price2="", $price3="") { echo $price + $price2 + $price3; }
You can then call calculate(), passing along just $price and $price3, like so: calculate(10, "", 3); This returns the following value: