87 lines
2.1 KiB
Markdown
87 lines
2.1 KiB
Markdown
# Beeme (Basic Equation/Expression Math Engine)
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Simple mathematical expression parser and calculator *based on the great work of
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Adrean Boyadzhiev*.
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## Install
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The recommended way to install Beeme is [through composer](http://getcomposer.org).
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```JSON
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{
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"require": {
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"oat-sa/lib-beeme": "dev-master"
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}
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}
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```
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## Basic Usage
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Here is an simple example of evaluation of mathematical expression
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```php
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<?php
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$parser = new \oat\beeme\Parser();
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$expression = '1 + 2 * 3 * ( 7 * 8 ) - ( 45 - 10 )';
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$result = $parser->evaluate($expression);
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echo $result; // 302.000000
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```
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## Constants
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Beeme comes with two built-in constants that are "_pi_" and "_e_". You can also use custom constans in your expressions,
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and give them actual values at runtime. Below, an example with the constant "_x_" replaced by the integer value 3.
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```php
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<?php
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$parser = new \oat\beeme\Parser();
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$expression = '3 + x';
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$result = $parser->evaluate(
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$expression,
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['x' => 3]
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);
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echo $result; // 6.000000
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```
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## Functions
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Beeme provides a set of unary functions to be used in your expressions. Below is an example of using the "_abs_" function
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in an expression.
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```php
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<?php
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$expression = '1 + abs(x)';
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$result = $parser->evaluate(
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$expression,
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['x' => -10]
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);
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echo $result; // 11.000000
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```
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Please see the list of available unary functions available in Beeme. They all map to their PHP built-in equivalent:
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* [abs](http://php.net/manual/en/function.abs.php)
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* [sin](http://php.net/manual/en/function.sin.php)
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* [sinh](http://php.net/manual/en/function.sinh.php)
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* [asin](http://php.net/manual/en/function.asin.php)
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* [asinh](http://php.net/manual/en/function.asinh.php)
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* [cos](http://php.net/manual/en/function.cosh.php)
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* [acos](http://php.net/manual/en/function.acos.php)
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* [tan](http://php.net/manual/en/function.tan.php)
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* [tanh](http://php.net/manual/en/function.tanh.php)
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* [atan](http://php.net/manual/en/function.atan.php)
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* [exp](http://php.net/manual/en/function.exp.php)
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* [ceil](http://php.net/manual/en/function.ceil.php)
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* [floor](http://php.net/manual/en/function.floor.php)
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## TODO
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- Always more unit tests
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- N-ary functions
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## License
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MIT, see LICENSE.
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