function msubstr($str, $start=0, $length, $charset="utf-8", $suffix=true) {
if(function_exists("mb_substr")){
$slice = mb_substr($str, $start, $length, $charset);
$strlen = mb_strlen($str,$charset);
}elseif(function_exists('iconv_substr')) {
$slice = iconv_substr($str,$start,$length,$charset);
$strlen = iconv_strlen($str,$charset);
if(false === $slice) {
$slice = '';
}
}else{
$re['utf-8'] = "/[\x01-\x7f]|[\xc2-\xdf][\x80-\xbf]|[\xe0-\xef][\x80-\xbf]{2}|[\xf0-\xff...