DeductiveFormula
DeductiveFormula is library evaluate expression of variables from given string
Install via "composer require"
composer require rizalmf/deductive-formula
Usage:
use rizalmf\formula\DeductiveFormula;
use rizalmf\formula\exception\FormulaException;
require_once __DIR__ . '/vendor/autoload.php'; // example path
$formula = new DeductiveFormula();
Example 1: (Define Expressions & Set Formula)
try {
$expression = '{foo}^({bar}/2+(2+3^(1/2)))';
$requestedVariables = $this->formula->setFormula($expression);
var_dump($requestedVariables);
} catch (FormulaException $e) {
// handle Exceptions
}
// output : array ([0] => "foo", [1] => "bar")
Example 2: (Set Variables)
// ...
// 1. define value per variable
$this->formula->setVariable("foo", 4);
$this->formula->setVariable("bar", 1);
// 2. use array
$this->formula->setVariables([
"foo" => 4,
"bar" => 1
]);
Example 3: (Get Variables)
// ...
// 1. get value from specific variable
var_dump($this->formula->getVariable("foo"));
// output : 4
// 2. get values all variables
var_dump($this->formula->getVariables());
// output : array ([foo] => 4, [bar] => 1)
// 1. get possible variables from Formula
var_dump($this->formula->getRequestedVariables());
// output : array ([0] => "foo", [1] => "bar")
Example 4: (Evaluate)
$result = $this->formula->execute();
var_dump($result);
// output : 353.141268350837
Example 5: (Set Limit Iteration & Debug)
// (optional) set limit iteration calculating machine. default 200
$formula->setLimit(50);
// debug
$result = $this->formula->execute(true);
var_dump($result);
// output :
// iteration-1 => 4^(1/2+(2+3^(1/2)))
// iteration-2 => 4^(1/2+(2+3^0.50))
// iteration-3 => 4^(1/2+(2+1.73205080756888))
// iteration-4 => 4^(1/2+3.73205080756888)
// iteration-5 => 4^(0.50+3.73205080756888)
// iteration-6 => 4^4.23205080756888
// 353.141268350837
Exception Tree
FormulaException
|- BadFormulaException
Unit Test:
- Composer is a prerequisite for running the tests.
composer install
- The tests can be executed by running this command from the root directory:
./vendor/bin/phpunit test
LICENSE
The MIT License (MIT) Copyright (c) 2021 Rizal Maulana Fahmi