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<?php declare(strict_types=1); namespace Psl\Str\Grapheme; use Psl\Str; use function grapheme_strripos; /** * Returns the last position of the 'needle' string in the 'haystack' string, * or null if it isn't found (case-insensitive). * * An optional offset determines where in the haystack (from the beginning) the * search begins. * * If the offset is negative, the search will begin that many * characters from the end of the string and go backwards. * * @pure * * @throws Str\Exception\OutOfBoundsException If $offset is out-of-bounds. * @throws Str\Exception\InvalidArgumentException If $haystack is not made of grapheme clusters. * * @return null|int<0, max> */ function search_last_ci(string $haystack, string $needle, int $offset = 0): ?int { if ('' === $needle) { return null; } $offset = Str\Internal\validate_offset($offset, length($haystack)); /** @var null|int<0, max> */ return false === ($pos = grapheme_strripos($haystack, $needle, $offset)) ? null : $pos; }
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