copyright : (c) BardiQi

contact us : bardoqi@gmail.com

license: : http://open-real-estate.info/en/license

Php Formula Calculate Class is a library for parsing and evaluating mathematical formulas given as strings.

Supports:

• Operators: +, -, *, /, ^
• Variables: Any letter or word.
• Numbers with decimal point '.'
• Functions: all php math finctions,such as sin,sqrt...
• Unlimited nested parentheses

Requires PHP 5.4 or higher.

To install with Composer:

composer require BaroQi/Php-Formula-Calculate-Class

use Bulo\Library\Std\MathUtil;

$expression = 'x+(sqrt(5)-1)/2';
$varibles = (['x' => 1]);

try {
    $ret = MathUtil::parseExpression($expression,$varibles);
    echo $ret; //2.6180339
} catch (\Exception $e) {
    echo $e->getMessage(), "\n";
}

It is very simple! Please to read the comment.

Fixed the bug: Only could running in php5. Now it could running in php7. Enhance support for php7.2 .

Fixed the bug: Return false when division by zero. Now throw a new Exception.