検証日: 2025/04/18 PHP: 8.4.6 Node 23.11.0 対象 "こんにちは" "This is a pen" "𠮷野" "󠁧󠁢󠁷󠁬󠁳󠁿" strlen() (PHP) 15 13 7 28 mb_strlen() (PHP) 5 13 2 7 iconv_strlen() (PHP) 5 13 2 7 grapheme_strlen() (PHP) 5 13 2 1 String.length (Node) 5 13 3 14…