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<?php declare(strict_types=1); namespace Dotenv\Util; use GrahamCampbell\ResultType\Error; use GrahamCampbell\ResultType\Success; use PhpOption\Option; /** * @internal */ final class Str { /** * This class is a singleton. * * @codeCoverageIgnore * * @return void */ private function __construct() { // } /** * Convert a string to UTF-8 from the given encoding. * * @param string $input * @param string|null $encoding * * @return \GrahamCampbell\ResultType\Result<string, string> */ public static function utf8(string $input, ?string $encoding = null) { if ($encoding !== null && !\in_array($encoding, \mb_list_encodings(), true)) { /** @var \GrahamCampbell\ResultType\Result<string, string> */ return Error::create( \sprintf('Illegal character encoding [%s] specified.', $encoding) ); } $converted = $encoding === null ? @\mb_convert_encoding($input, 'UTF-8') : @\mb_convert_encoding($input, 'UTF-8', $encoding); if (!is_string($converted)) { /** @var \GrahamCampbell\ResultType\Result<string, string> */ return Error::create( \sprintf('Conversion from encoding [%s] failed.', $encoding ?? 'NULL') ); } /** * this is for support UTF-8 with BOM encoding * @see https://en.wikipedia.org/wiki/Byte_order_mark * @see https://github.com/vlucas/phpdotenv/issues/500 */ if (\substr($converted, 0, 3) == "\xEF\xBB\xBF") { $converted = \substr($converted, 3); } /** @var \GrahamCampbell\ResultType\Result<string, string> */ return Success::create($converted); } /** * Search for a given substring of the input. * * @param string $haystack * @param string $needle * * @return \PhpOption\Option<int> */ public static function pos(string $haystack, string $needle) { /** @var \PhpOption\Option<int> */ return Option::fromValue(\mb_strpos($haystack, $needle, 0, 'UTF-8'), false); } /** * Grab the specified substring of the input. * * @param string $input * @param int $start * @param int|null $length * * @return string */ public static function substr(string $input, int $start, ?int $length = null) { return \mb_substr($input, $start, $length, 'UTF-8'); } /** * Compute the length of the given string. * * @param string $input * * @return int */ public static function len(string $input) { return \mb_strlen($input, 'UTF-8'); } }
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