Is it possible to calculate a math function f(x) that in a string. Something like this:
$function = '2x+3'; $x = 4; math_function($function, $x); //Shoud produce 11
I can’t find a library for tasks like this on PHP.net or with Google, but I don’t think I am the first one that wants this?
Here is Solutions:
We have many solutions to this problem, But we recommend you to use the first solution because it is tested & true solution that will 100% work for you.
My standard answer to this question whenever it crops up:
Don’t use eval (especially if the formula contains user input) or reinvent the wheel by writing your own formula parser.
Take a look at the evalMath class on PHPClasses. It should do everything that you want in a nice safe sandbox.
Note: Use and implement solution 1 because this method fully tested our system.
Thank you 🙂