Calculator
, (*1)
Simple PHP calculator, inspired by shunting-yard algorithm., (*2)
It supports basic operators (+, -, /, *, ^), trigonometric operators and precedence., (*3)
Compatibility
Operators
Operator precedence follows the standard (see Wikipedia):, (*4)
| Operator |
Alias |
Precedence |
Description |
^ |
** |
High |
exponent (power) |
√ |
sqrt |
High |
square root |
! |
High |
Fibonacci number |
% |
High |
percentage |
* |
Medium |
multiplication |
/ |
Medium |
division |
sin |
Medium |
sine |
cos |
Medium |
cosine |
tan |
Medium |
tangent |
asin |
Medium |
arc sine |
acos |
Medium |
arc cosine |
atan |
Medium |
arc tangent |
+ |
Low |
addition |
- |
Low |
subtraction |
How to use it
A working example is available in samples/basic.php., (*5)
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
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