Question

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how to evaluate formula passed as string in php?

I have a string like “10*0.1+800” I would like to get the actual answer of the this string in numeric instead of the string value.

I have tried floatval php function but had no luck. Any idea?

Answer 1

You would have to “evaluate” the string using the eval function of PHP:

eval('return ' . $string . ';');

But i would really only do this, if you can trust the string. Because what you are doing here is indeed executing PHP code. It’s a possible security hole, if you can’t trust the string.

The other possible option would be to use a parser. I am sure, there are already any libraries for this task available.