in src/str/utf8/introspect.php [43:52]
function search(string $haystack, string $needle, int $offset = 0)[rx_local]: ?int {
$offset = _Private\validate_offset($offset, length($haystack));
/* HH_FIXME[2049] __PHPStdLib */
/* HH_FIXME[4107] __PHPStdLib */
$position = \mb_strpos($haystack, $needle, $offset, Encoding::UTF8);
if ($position === false) {
return null;
}
return $position;
}