Calculate a sum in a string

Question

I have string like this: $string = \"a + b + c\";. Now I would like to calculate the string as sum.

For example:

$a = 10;
$b = 10;
$c =          


        

Answer 1

you can do:

$string = "$res = $a + $b + $c;";
eval($string)
echo($res);