String to Sum

[iwarlord]

Does anyone know of a string to sum type function?

I'm wanting to convert a string such as "22-12-6+5" into an int 9.

 

I can't find anything in the documentation, but maybe I'm missing something.

 

Can anyone help?

 

Thanks.

[.josh]

Make sure you validate $string if you're getting that from user (like from a form).

 

$string = "22-12-6+5";
eval("\$sum = $string;");
echo $sum;

[corbin]

http://www.google.com/search?hl=en&q=php+math+parsing&btnG=Google+Search&aq=f&oq=

 

 

If you didn't want to have to use eval, you could always write a parser with regular expressions.  A small parser that can just handle the basic operations wouldn't be hard at all.  But, as long as that is the case, eval would work just as well, be faster, and of course be easier.