README

Simple PHP calculator, inspired by shunting-yard algorithm.

It supports basic operators (+, -, /, *, ^), trigonometric operators and precedence.

Compatibility

Operators

Operator precedence follows the standard (see Wikipedia):

How to use it

A working example is available in samples/basic.php.

use Calculator\Calculator;

$calculator = new Calculator();

// ----------------------------
// Basic operators
// ----------------------------
$calculator->number(1)
    ->operator('+')->number(5)
    ->operator('*')->number(3.5)
    ->operator('/')->number(2)
    ->execute();

echo $calculator;
// ==> 1 + 5 * 3.5 / 2 = 9.75

// ----------------------------
// Power
// ----------------------------
$calculator->number(2)
    ->operator('*')->number(2)
    ->operator('^')->number(4)
    ->execute();

echo $calculator;
// ==> 2 * 2 ^ 4 = 32

// ----------------------------
// Square root
// ----------------------------
$result = $calculator->number(9)
    ->operator('√')
    ->execute();

echo $calculator;
// ==> √9 = 3

// ----------------------------
// Trigonometry
// ----------------------------
$result = $calculator->number(1)
    ->operator('cos')
    ->execute();

echo $calculator;
// ==> cos(1) = 0.54030230586814

// ----------------------------
// Fibonacci number
// ----------------------------
$result = $calculator->number(40)
    ->operator('!')
    ->execute();

echo $calculator;
// ==> 40! = 102334155

// ----------------------------
// Percentage
// ----------------------------
$result = $calculator->number(40.32)
    ->operator('%')
    ->execute();

echo $calculator;
// ==> 40.32% = 0.4032

// ----------------------------
// Group operations (parentheses)
// ----------------------------
$result = $calculator
    ->group(function (Calculator $calculator) {
        $calculator
            ->number('pi')
            ->operator('/')->number(4);
    })
    ->operator('cos')
    ->execute();

echo $calculator;
// ==> cos(pi / 4) = 0.7071067811865