with PHP prepared by the expression calculators, is the translation of knowledge to achieve, and are not using eval () function to achieve. Powerful, can do all the numerical calculation, algebraic calculations also can not be achieved. 1. Shape can be calculated as "-3* sin (2 ^ 0.5/2 3.1415)- pi () ^ 2" formula. 2. Can identify figures (including decimal, plus or minus a few), math functions. 3. Can do, plus or minus, multiplication, addition, the index, calculated from model (which, plus or minus one yuan and include both binary operation). Compression bundle "math.php" Presentations

action.js
eval_expr_to_rpn.php
eval_my_function.php
eval_rpn.php
math.php
style.css

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