UseBB 中文字符截断函数（UTF-8）修改
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在UseBB中在首页最后发表要用到一个函数entities_rtrim，由于UseBB是采用的ISO-8859-1编码，所以当使用中文的时候，最后一个字符会被截断，进而照成乱码。所以，将该函数修改了一下，以适应中文版式。
找到UseBB/sources/functions.php，查找函数：*function entities_rtrim*
function entities_rtrim($string, $length) {
$new_string = '';
$new_length = $pos = 0;
$entity_open = false;
if ( function_exists('mb_language') && mb_language() != 'neutral') {
$strlen = 'mb_strlen';
$substr = 'mb_substr';
} else {
$strlen = 'strlen';
$substr = 'substr';
}
while ( $pos < $strlen($string) && ( $new_length < $length ||
$entity_open ) ) {
$char = $substr($string, $pos, 1);
if ( $char == '&' ) {
$entity_open = true;
} elseif ( $char == ';' && $entity_open ) {
$entity_open = false;
$new_length++;
} elseif ( !$entity_open ) {
$new_length++;
}
$new_string .= $char;
$pos++;
}
return $new_string;
}
替换成：
function entities_rtrim($str, $lenth)
{
$start=0;
$len = strlen($str);
$r = array();
$n = 0;
$m = 0;
for($i = 0; $i < $len; $i++)
{
$x = substr($str, $i, 1);
$a = base_convert(ord($x), 10, 2);
$a = substr('00000000'.$a, -8);
if ($n < $start)
{
if (substr($a, 0, 1) == 0)
{
}
elseif (substr($a, 0, 3) == 110)
{
$i += 1;
}
elseif (substr($a, 0, 4) == 1110)
{
$i += 2;
}
$n++;
}
else
{
if (substr($a, 0, 1) == 0)
{
$r[] = substr($str, $i, 1);
}
elseif (substr($a, 0, 3) == 110) {
$r[] = substr($str, $i, 2);
$i += 1;
}elseif (substr($a, 0, 4) == 1110) {
$r[] = substr($str, $i, 3);
$i += 2;
}else{
$r[] = '';
}
if (++$m >= $lenth){
break;
}
}
}
$trunstr=join('',$r);
return $trunstr;
}