Easy to use PHP Bitcoin and Litecoin address validator. One day I will add other crypto currencies. Or how about you? :)
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composer require merkeleon/php-cryptocurrency-address-validation
use Merkeleon\PhpCryptocurrencyAddressValidation\Enums\CurrencyEnum;use Merkeleon\PhpCryptocurrencyAddressValidation\Validator;
$validator = Validator::make(CurrencyEnum::BITCOIN);
var_dump($validator->isValid('1QLbGuc3WGKKKpLs4pBp9H6jiQ2MgPkXRp'));