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# MathExecutor [](https://waffle.io/NeonXP/MathExecutor) [](https://travis-ci.org/NeonXP/MathExecutor)
A simple math expressions calculator
## Features:
* Built in support for +, -, *, / and power (^) operators
* Support for user defined operators
* Support for user defined functions
* Unlimited varable length
* String support, as function parameters or as evaluated by PHP
* Exceptions on divide by zero, or treat as zero
* Unary Minus
## Install via Composer:
Stable branch
```
composer require "nxp/math-executor" "dev-master"
```
Dev branch (currently unsupported)
```
composer require "nxp/math-executor" "dev-dev"
```
## Sample usage:
```php
require "vendor/autoload.php";
$executor = new \NXP\MathExecutor();
echo $executor->execute("1 + 2 * (2 - (4+10))^2 + sin(10)");
```
## Functions:
Default functions:
* sin
* cos
* tn
* asin
* acos
* atn
* min
* max
* avg
Add custom function to executor:
```php
$executor->addFunction('abs', function($arg) {
return abs($arg);
}, 1);
```
## Operators:
Default operators: `+ - * / ^`
Add custom operator to executor:
```php
<?php
namespace MyNamespace;
use NXP\Classes\Token\AbstractOperator;
class ModulusToken extends AbstractOperator
{
/**
* Regex of this operator
* @return string
*/
public static function getRegex()
{
return '\%';
}
/**
* Priority of this operator
* @return int
*/
public function getPriority()
{
return 3;
}
/**
* Associaion of this operator (self::LEFT_ASSOC or self::RIGHT_ASSOC)
* @return string
*/
public function getAssociation()
{
return self::LEFT_ASSOC;
}
/**
* Execution of this operator
* @param InterfaceToken[] $stack Stack of tokens
* @return TokenNumber Result of execution
*/
public function execute(&$stack)
{
$op2 = array_pop($stack);
$op1 = array_pop($stack);
$result = $op1->getValue() % $op2->getValue();
return new TokenNumber($result);
}
}
```
And adding to executor:
```php
$executor->addOperator('MyNamespace\ModulusToken');
```
## Variables:
Default variables:
```
$pi = 3.14159265359
$e = 2.71828182846
```
You can add own variable to executor:
```php
$executor->setVars([
'var1' => 0.15,
'var2' => 0.22
]);
echo $executor->execute("$var1 + $var2");
```
## Division By Zero Support:
By default, the result of division by zero is zero and no error is generated. You have the option to thow a \NXP\Exception\DivisionByZeroException by by calling setDivisionByZeroException.
```php
$executor->setDivisionByZeroException();
try {
echo $executor->execute('1/0');
} catch (\NXP\Exception\DivisionByZeroException $e) {
echo $e->getMessage();
}
```
## Unary Minus Operator:
Negative numbers are supported via the unary minus operator, but need to have a space before the minus sign. `-1+ -3` is legal, while '`-1+-3` will produce an error due to the way the parser works. Positive numbers are not explicitly supported as unsigned numbers are assumed positive.
## String Support:
Expressions can contain double or single quoted strings that are evaluated the same way as PHP. You can also pass strings to functions.
```php
echo $executor->execute("1 + '2.5' * '.5' + myFunction('category')");
```
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