gistfile1.txt

<?php

class Booleanish {

    const TRUTHY = ['y', 'true', 'yes', 'j', 'ja', 'on', '1'];

    const FALSEY = ['n', 'false', 'no', 'nee', 'off', '0'];

    private $value;

    private function __construct($value) {
        $this->value = $this->getBooleanFromValue($value);
    }

    public static function fromValue($value)
    {
        return new static($value);
    }

    private function getBooleanFromValue($value)
    {
        $type = gettype($value);
        if ($type === 'boolean') {
            return $value;

        }
        if ($type === 'integer' && in_array($value, [0, 1])) {
            return $value === 1;
        }
        if ($type !== 'string') {
            throw new RuntimeException('Unsupported type');
        }

        $value = strtolower($value);
        if (in_array($value, static::TRUTHY)) {
            return true;
        }
        if (in_array($value, static::FALSEY)) {
            return false;
        }

        throw new RuntimeException('Invalid value');
    }

    public function value()
    {
        return $this->value;
    }

    public function to($true, $false)
    {
        if ($this->value) {
            return $true;
        }

        return $false;
    }
}