EthD20.php

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<?php

namespace Ethereum\DataType;

use Ethereum\DataType\EthQ;

class EthD20 extends EthD
{
    public function validateLength($val)
    {
        $un_padded = $this->unPadEnsureLength($val);
        if ($un_padded) {
            return $un_padded;
        } else {
            throw new \InvalidArgumentException('Invalid length for hex binary: ' . $val);
        }
    }

    public static function unPadEnsureLength($string)
    {

        // Remove leading zeros.
        // See: https://regex101.com/r/O2Rpei/5
        $matches = [];
        if (preg_match('/^0x0*([0-9,a-f]{40})$/is', self::ensureHexPrefix($string), $matches)) {
            $address = '0x' . $matches[1];
            // Throws an Exception if not valid.
            if (self::isValidAddress($address, true)) {
                return $address;
            }
        }
        return null;
    }

    public function isNotNull() {
        $checkForValue = new EthQ($this->value);
        return $checkForValue->isNotNull();
    }

    public static function getDataLengthType()
    {
        return 'static';
    }

}