PHP Alternative to "eval" function

I would like an alternative to "eval" but only for simple math operations and logic operator but must to include IF statement, like these: 123 + 345 122 + (2*78) 8 - 876 + 15 15/3 if (3 > 2) then 12 if (1 = 1) then this is ok OUTPUTS: 468 278 - 853 5 12 this is ok It is fine is we support only one IF statement. I don't mind if we need to use another word instead of "if", I just need to get the logic. The input are always strings. It is fine if the IF statement supports only numeric values. My budget is: USD 50 Only apply if you have this already done, I don't want to wait until you develop this from scratch. Please show me a demo of what you have. Thanks.