function mb_substr($str, $start = 0, $length = NULL) { if (!isset($length)) { $length = mb_strlen($str) - $start; } $rtn = jsubstr(jcode_convert_encoding($str, "EUC-JP", _CHARSET), $start, $length); return jcode_convert_encoding($rtn, _CHARSET, "EUC-JP"); }
function mb_substr($str, $start, $length = NULL, $encoding = '') { // 注: EUC-JP専用, $encodingを使用しない return jsubstr($str, $start, $length === NULL ? jstrlen($str) : $length); }