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<?php declare(strict_types=1); namespace Psl\Str; use function mb_substr; /** * Returns a substring of length `$length` of the given string starting at the * `$offset`. * * If no length is given, the slice will contain the rest of the * string. If the length is zero, the empty string will be returned. If the * offset is out-of-bounds, an `Exception\OutOfBoundsException` will be thrown. * * @param null|int<0, max> $length * * @throws Exception\OutOfBoundsException If the $offset is out-of-bounds. * * @pure */ function slice(string $string, int $offset, ?int $length = null, Encoding $encoding = Encoding::UTF_8): string { $string_length = length($string, $encoding); $offset = Internal\validate_offset($offset, $string_length); if (0 === $offset && (null === $length || $string_length <= $length)) { return $string; } return mb_substr($string, $offset, $length, $encoding->value); }
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