How to parse a string of boolean logic in PHP

Question

I\'m building a PHP class with a private member function that returns a string value such as:

\'true && true || false\'

to a public

Answer 1

eval() will work perfectly fine for this, but remember you have to tell it to return something.

$string = "true && true || false";
$result = eval("return (".$string.");"); // $result will be true

Also make sure you sanitize any user inputs if putting them directly into an eval().