README

PHP library for mathematical operations including median, average, sum, and formula processing.

Features

• Basic Statistical Functions: median, average, sum
• Formula Processor: Process complex mathematical formulas with nested functions and parameters
• Secure Evaluation: Protected against code injection attacks
• Pure PHP: No dependencies (except PHPUnit for development)

Installation

composer require kachnitel/math-utils

Usage

Basic Operations

use Kachnitel\MathUtils\Math;

// Calculate median
$median = Math::median([1, 2, 3, 4, 5]); // 3

// Calculate average
$average = Math::average([1, 2, 3, 4, 5]); // 3

// Calculate sum
$sum = Math::sum([1, 2, 3, 4, 5]); // 15

Formula Processing

The formula processor supports nested functions, parameters, and basic arithmetic operations (+, -, *, /).

use Kachnitel\MathUtils\Math;

// Simple formula
$result = Math::process('1 + 1', []); // 2

// Formula with parameters
$result = Math::process('$0 * $1', [2, 3]); // 6

// Complex nested formula
$result = Math::process(
    'average([average([sum($0), sum($1)]),median($2)]) * 2',
    [
        [1, 2, 3, 4],    // $0
        [5, 6, 7, 8],    // $1
        [10, 11, 12]     // $2
    ]
); // Calculated result

// Track calculation steps
$steps = [];
$result = Math::process('average([sum($0), sum($1)])', [[1, 2], [3, 4]], $steps);
// $steps will contain each step of the calculation

Supported Functions in Formulas

• sum(array) - Sum of array elements
• average(array) - Average of array elements
• median(array) - Median of array elements

Security

The formula processor is protected against code injection. All formulas are validated before evaluation:

// This will throw MathException
Math::process('1 + 1; echo "injection";', []);

Requirements

• PHP 8.2 or higher

License

MIT License - see LICENSE file for details