BooleanUtils.php

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<?php
namespace Magento\Framework\Stdlib;

class BooleanUtils
{
    private $trueValues;

    private $falseValues;

    public function __construct(
        array $trueValues = [true, 1, 'true', '1'],
        array $falseValues = [false, 0, 'false', '0']
    ) {
        $this->trueValues = $trueValues;
        $this->falseValues = $falseValues;
    }

    // @codingStandardsIgnoreEnd

    public function toBoolean($value)
    {
        if (in_array($value, $this->trueValues, true)) {
            return true;
        }
        if (in_array($value, $this->falseValues, true)) {
            return false;
        }
        $allowedValues = array_merge($this->trueValues, $this->falseValues);
        throw new \InvalidArgumentException(
            'Boolean value is expected, supported values: ' . var_export($allowedValues, true)
        );
    }

    public function convert($value)
    {
        if (in_array($value, $this->trueValues, true)) {
            return true;
        } elseif (in_array($value, $this->falseValues, true)) {
            return false;
        } else {
            return $value;
        }
    }
}