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<?php declare(strict_types=1); namespace Psl\Str\Grapheme; use Psl\Str; /** * 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. * * @param null|int<0, max> $length * * @pure * * @throws Str\Exception\OutOfBoundsException If $offset is out-of-bounds. * @throws Str\Exception\InvalidArgumentException If $string is not made of grapheme clusters. */ function slice(string $string, int $offset, ?int $length = null): string { $string_length = length($string); $offset = Str\Internal\validate_offset($offset, $string_length); if (0 === $offset && (null === $length || $string_length <= $length)) { return $string; } if (null === $length) { return (string) grapheme_substr($string, $offset); } return (string) grapheme_substr($string, $offset, $length); }
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