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$string±íʾÎÄ×Ö´¦ÀíµÄ¶ÔÏó
$sublen±íʾÎÄ×Ö¿ØÖƵij¤¶È

function cnsubstr($string,$sublen)
{
    if($sublen>=strlen($string))
    {
        return $string;
    }
    $s="";
    for($i=0;$i<$sublen;$i++)
    {
        if(ord($string{$i})>127)
        {
            $s.=$string{$i}.$string{++$i};
            continue;
        }else{
            $s.=$string{$i};
            continue;
        }
    }
    if(strlen($string)>$sublen) $s.="...";
    return $s;
}

$content = [color=Red]cnsubstr[/color]($content,280);

###################################################
ÎÄ×ÖÅÅÁиñʽ:
$content = str_replace(" ","$nbsp; ",[color=Red]cnsubstr($content,280));[/color]
$content = str_replace("\r\n\r\n","<br>",$content);
$content = str_replace("\r\n\n","<br>",$content);
$content = str_replace("\r\n","<br>",$content);
$content = str_replace("\\n","<br>",$content);
$content = str_replace("\n","<br>",$content);