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<?php declare(strict_types=1); namespace Psl\Str; use function mb_strpos; /** * Returns the first position of the 'needle' string in the 'haystack' string, * or null if it isn't found. * * An optional offset determines where in the haystack the search begins. If the * offset is negative, the search will begin that many characters from the end * of the string. * * @pure * * @throws Exception\OutOfBoundsException If the $offset is out-of-bounds. * * @return null|int<0, max> */ function search(string $haystack, string $needle, int $offset = 0, Encoding $encoding = Encoding::UTF_8): ?int { if ('' === $needle) { return null; } $offset = Internal\validate_offset($offset, length($haystack, $encoding)); /** @var null|int<0, max> */ return false === ($pos = mb_strpos($haystack, $needle, $offset, $encoding->value)) ? null : $pos; }