iserter / expression-evaluator

Evaluate string expressions in PHP without eval() function

Expression Evaluator

I looked around so much to find an expression evaluator, and none of my findings supported logical and comparison operators. I created this package from a gist I found. I will be writing a service provider for Laravel 5.1 soon.

Example Usage

$exEngine = new ExpressionEvaluator\Engine;

echo $exEngine->evalute('5 + 3 * 2');

// outputs 11

Example evaluations

5 + 3 * 2

11

(1 > 2 AND 3 < 2) OR 1+2 == 3

0

(3 > 2) AND (3 < 5)

1

(1 > 2) OR (3 < 5)

1

(1 > 2) OR (6 > 5)

1

(1 > 2) OR (6 < 5)

0

1 + 2 == 3

1

2 < 1 + 2

2

(2 < 1) + 2

2

((2 < 1) + 2) == 2

1

-8/-2

4

-8/2

-4

-8/-2 + 15 * 1

19

Inspired by & developed upon https://gist.github.com/ircmaxell/1232629