An improved UBB class_PHP tutorial-PHP Tutorial-php.cn

/*
If reprinted, please indicate the author

Original author: He Zhiqiang
Improvement: SonyMusic[ sonymusic@163.net ]
File: ubb. php
Note: It is said to be an improvement, but in fact the core function parse() has been completely rewritten, and the idea is also different.
However, it is still inspired by He Zhiqiang’s example, and the test examples and several functions such as URLCHECK also follow He Zhiqiang’s program. Thank you He Zhiqiang.
There is no color feature yet, but I will add it.
If there are any bugs or inconveniences in the program, please email me.
Thank you!
Improved functions:
UBB encoding for strings. This class currently only supports the following simple and practical encodings:
1. URL link
[url] http://phpuser. com/ [/url]
The http:// header is not required
For example, [url]phpuser.com[/url] is also acceptable.
2. Email link
[email] sonymusic@163.net [/email]
3. Picture link
[img] http://www.phpchina.com/images/logo .gif [/img]
Same as URL link, the previous http is optional.
4. Text
[b]Bold font[/b]
[i]Italic font[/i]
[u]Underline[/u]
[h1] Title word No. 1[/h1] ... [h6]Title word No. 6[/h6]
[sup][/sup]
[sub][/sub]
[tt][/ tt]
[s][/s]
[strike][/strike]
[em][/em]
[strong][/strong]
[code][/ code]
[samp][/samp]
[kbd][/kbd]
[var][/var]
[dfn][/dfn]
[cite][/ cite]
[small][/small]
[big][/big]
[blink][/blink]
Note the following points:
1. url, email, img Tags are not case-sensitive.
2. The TAB key is not allowed in tags, but spaces are allowed.
3. This class needs to call htmlencode, htmlencode4textarea, emailcheck function and urlcheck class.
4. After modification, nesting is supported, but nesting of url, email, and img tags is not allowed.
Technical information:
Ultimate Bulletin Board
http://www.ultimatebb.com/
What is UBB Code
http://www.scriptkeeper.com/ubb/ubbcode.html
*/

include("urlcheck.php");
include("otherfunc.php"); //The contents of these two files are attached at the end.

//ubbcode类
class ubbcode{
var $call_time=0;
//可处理标签及处理函数对应表
var $tags = array( //小写的标签 => 对应的处理函数
'url' => '$this->url',
'email' => '$this->email',
'img' => '$this->img',
'b' => '$this->simple',
'i' => '$this->simple',
'u' => '$this->simple',
'tt' => '$this->simple',
's' => '$this->simple',
'strike' => '$this->simple',
'h1' => '$this->simple',
'h2' => '$this->simple',
'h3' => '$this->simple',
'h4' => '$this->simple',
'h5' => '$this->simple',
'h6' => '$this->simple',
'sup' => '$this->simple',
'sub' => '$this->simple',
'em' => '$this->simple',
'strong' => '$this->simple',
'code' => '$this->simple',
'samp' => '$this->simple',
'kbd' => '$this->simple',
'var' => '$this->simple',
'dfn' => '$this->simple',
'cite' => '$this->simple',
'small' => '$this->simple',
'big' => '$this->simple',
'blink' => '$this->simple'
);
//url裢接属性
var $attr_url;
//url合法性检查对象
var $urlcheck;

function ubbcode($attr_url){
$this->attr_url = ''.$attr_url;
$this->urlcheck = new urlcheck();
}

//对$str进行UBB编码解析
function parse($str){
$this->call_time++;
$parse = ''.htmlencode($str);

$ret = '';
while(true){
$eregi_ret=eregi("[[#]{0,1}[[:alnum:]]{1,7}]",$parse,$eregi_arr); //查找[xx]
if(!$eregi_ret){
$ret .= $parse;
break; //如果没有，返回
}
$pos = @strpos ($parse,$eregi_arr[0]);
$tag_len=strlen($eregi_arr[0])-2;//标记长度
$tag_start=substr($eregi_arr[0],1,$tag_len);
$tag=strtolower($tag_start);

if((($tag=="url") or ($tag=="email") or ($tag=="img")) and ($this->call_time>1)){
echo $this->call_time."
";
return $parse;//如果不能是不能嵌套的标记，直接返回
}

$parse2 = substr($parse,0,$pos);//标记之前
$parse = substr($parse,$pos+$tag_len+2);//标记之后
if(!isset($this->tags[$tag])){
echo "$tag_start
";
$ret .= $parse2.'['.$tag_start.']';
continue;//如果是不支持的标记
}

//查找对对应的结束标记
$eregi_ret=eregi("[/".$tag."]",$parse,$eregi_arr);
if(!$eregi_ret){
$ret .= $parse2.'['.$tag_start.']';
continue;//如果没有对应该的结束标记
}
$pos=strpos($parse,$eregi_arr[0]);
$value=substr($parse,0,$pos);//这是起止标记之间的内容
$tag_end=substr($parse,$pos+2,$tag_len);
$parse=substr($parse,$pos+$tag_len+3);//结束标记之后的内容

if(($tag!="url") and ($tag!="email") and ($tag!="img")){
$value=$this->parse($value);
}

$ret .= $parse2;
eval('$ret .= '.$this->tags[$tag].'("'.$tag_start.'","'.$tag_end.'","'.$value.'");');
}
$this->call_time--;
return $ret;
}

function simple($start,$end,$value){
return '<'.$start.'>'.$value.'';
}

function url($start,$end,$value){
$trim_value=trim($value);
if (strtolower(substr($trim_value,0,7))!="http://")
$trim_value="http://".$trim_value;
if($this->urlcheck->check($trim_value)) return 'attr_url.'>'.$value.'';
else return '['.$start.']'.$value.'[/'.$end.']';
}

function email($start,$end,$value){
if(emailcheck($value)) return ''.$value.'';
else return '['.$start.']'.$value.'[/'.$end.']';
}

function img($start,$end,$value){
$trim_value=trim($value);
if ((strtolower(substr($trim_value,0,7))!="http://") or ($this->urlcheck->check($trim_value)))
return '';
else return '['.$start.']'.$value.'[/'.$end.']';
}
}

//Test
echo '';
echo 'test';
echo '';
echo '

';

if(isset($ubb)){
$ubbcode = new ubbcode('target="_blank"');
echo '

'.$ubbcode->parse($ubb);
}

echo '';
echo ' ';

?>

Contents of file urlcheck.php:
//urlcheck.php
class urlcheck{
var $regex = array(//Protocol name (note that it must be written in lowercase here) => Corresponding regular expression
'ftp' => '$this->ftpurl',
'file ' => '$this->fileurl',
'http' => '$this->httpurl',
'https' => '$this->httpurl',
'gopher' => '$this->gopherurl',
'news' => '$this->newsurl',
'nntp' => '$this-> nntpurl',
'telnet' => '$this->telneturl',
'wais' => '$this->waisurl'
);

var
var $hialpha;
var $alpha;
var $digit;
var $safe;
var $extra;
var $national;
var $ punctuation;
var $reserved;
var $hex;
var $escape;
var $unreserved;
var $uchar;
var $xchar;
var $digits ;

var $urlpath;
var $password;
var $user;
var $port;
var $hostnumber;
var $alphadigit;
var
var $domainlabel;
var $hostname;
var $host;
var $hostport;
var $login;

//ftp
var $ftptype;
var $fsegment;
var $fpath;
var $ftpurl;

//file
var $fileurl;

//http ,https
var $search;
var $hsegment;
var $hpath;
var $httpurl;

//gopher
var $gopher_string;
var $selector;
var $gtype;
var $gopherurl;

//news
var $article;
var $group;
var $grouppart;
var $newsurl;

//nntp
var $nntpurl;

//telnet
var $telneturl;

//wais
var $ wpath;
var $wtype;
var $database;
var $waisdoc;
var $waisindex;
var $waisdatabase;
var $waisurl;

function check($url){
$pos = @strpos ($url,':',1);
if($pos<1) return false;
$prot = substr($url, 0,$pos);
if(!isset($this->regex[$prot])) return false;
eval('$regex = '.$this->regex[$prot] .';');
return ereg('^'.$regex.'$',$url);
}

function urlcheck(){
$this-> lowalpha = '[a-z]';
$this->hialpha = '[A-Z]';
$this->alpha = '('.$this->lowalpha.'|'.$ this->hialpha.')';
$this->digit = '[0-9]';
$this->safe = '[$.+_-]';
$this->extra = '[*()'!,]';
$this->national = '([{}|^~`]|[|])';
$ this->punctuation = '[<>#%"]';
$this->reserved = '[?;/: @&= ]';
$this->hex = '('.$this->digit.'|[a-fA-F])';
$this->escape = '(%'.$this->hex.'{2})';
$this->unreserved = '('.$this->alpha.'|'.$this->digit.'|'.$this->safe.'|'.$this->extra.')';
$this->uchar = '('.$this->unreserved.'|'.$this->escape.')';
$this->xchar = '('.$this->unreserved.'|'.$this->reserved.'|'.$this->escape.')';
$this->digits = '('.$this->digit.'+)';

$this->urlpath = '('.$this->xchar.'*)';
$this->password = '(('.$this->uchar.'|[?;&=]'.')*)';
$this->user = '(('.$this->uchar.'|[?;&=]'.')*)';
$this->port = $this->digits;
$this->hostnumber = '('.$this->digits.'.'.$this->digits.'.'.$this->digits.'.'.$this->digits.')';
$this->alphadigit = '('.$this->alpha.'|'.$this->digit.')';
$this->toplabel = '('.$this->alpha.'|('.$this->alpha.'('.$this->alphadigit.'|-)*'.$this->alphadigit.'))';
$this->domainlabel = '('.$this->alphadigit.'|('.$this->alphadigit.'('.$this->alphadigit.'|-)*'.$this->alphadigit.'))';
$this->hostname = '(('.$this->domainlabel.'.)*'.$this->toplabel.')';
$this->host = '('.$this->hostname.'|'.$this->hostnumber.')';
$this->hostport = '('.$this->host.'(:'.$this->port.')?)';
$this->login = '(('.$this->user.'(:'.$this->password.')?@)?'.$this->hostport.')';

$this->ftptype = '[aidAID]';
$this->fsegment = '(('.$this->uchar.'|[?: @&= ])*)';
$this->fpath = '('.$this->fsegment.'(/'.$this->fsegment.')*)';
$this->ftpurl = '([fF][tT][pP]://'.$this->login.'(/'.$this->fpath.'(;[tT][yY][pP][eE]='.$this->ftptype.')?)?)';

$this->fileurl = '([fF][iI][lL][eE]://('.$this->host.'|[lL][oO][cC][aA][lL][hH][oO][sS][tT])?/'.$this->fpath.')';

$this->search = '(('.$this->uchar.'|[;: @&= ])*)';
$this->hsegment = '(('.$this->uchar.'|[;: @&= ])*)';
$this->hpath = '('.$this->hsegment.'(/'.$this->hsegment.')*)';
$this->httpurl = '([hH][tT][tT][pP][sS]?://'.$this->hostport.'(/'.$this->hpath.'([?]'.$this->search.')?)?)';

$this->gopher_string = '('.$this->xchar.'*)';
$this->selector = '('.$this->xchar.'*)';
$this->gtype = $this->xchar;
$this->gopherurl = '([gG][oO][pP][hH][eE][rR]://'.$this->hostport.'(/('.$this->gtype.'('.$this->selector.'(%09'.$this->search.'(%09'.$this->gopher_string.')?)?)?)?)?)';

$this->article = '(('.$this->uchar.'|[;/?:&=]) +@'.$this- >host.')';
$this->group = '('.$this->alpha.'('.$this->alpha.'|'.$this->digit.'|[-.+_])*)';
$this->grouppart = '([*]|'.$this->group.'|'.$this->article.')';
$this->newsurl = '([nN][eE][wW][sS]:'.$this->grouppart.')';

$this->nntpurl = '([nN][nN][tT][pP]://'.$this->hostport.'/'.$this->group.'(/'.$this->digits.')?)';

$this->telneturl = '([tT][eE][lL][nN][eE][tT]://'.$this->login.'/?)';

$this->wpath = '('.$this->uchar.'*)';
$this->wtype = '('.$this->uchar.'*)';
$this->database = '('.$this->uchar.'*)';
$this->waisdoc = '([wW][aA][iI][sS]://'.$this->hostport.'/'.$this->database.'/'.$this->wtype.'/'.$this->wpath.')';
$this->waisindex = '([wW][aA][iI][sS]://'.$this->hostport.'/'.$this->database.'[?]'$this->search.')';
$this->waisdatabase = '([wW][aA][iI][sS]://'.$this->hostport.'/'.$this->database.')';
$this->waisurl = '('.$this->waisdatabase.'|'.$this->waisindex.'|'.$this->waisdoc.')';
}
}

?>

文件otherfunc.php的内容：
//otherfunc.php
function htmlencode($str){
$str = (string)$str;

$ret = '';
$len = strlen($str);
$nl = false;
for($i=0;$i<$len;$i++){
$chr = $str[$i];
switch($chr){
case '<':
$ret .= '<';
$nl = false;
break;
case '>':
$ret .= '>';
$nl = false;
break;
case '"':
$ret .= '"';
$nl = false;
break;
case '&':
$ret .= '&';
$nl = false;
break;
/*
case ' ':
$ret .= ' ';
$nl = false;
break;
*/
case chr(9):
$ret .= '    ';
$nl = false;
break;
case chr(10):
if($nl) $nl = false;
else{
$ret .= '
';
$nl = true;
}
break;
case chr(13):
if($nl) $nl = false;
else{
$ret .= '
';
$nl = true;
}
break;
default:
$ret .= $chr;
$nl = false;
break;
}
}

return $ret;
}

function htmlencode4textarea($str){
$str = (string)$str;

$ret = '';
$len = strlen($str);
for($i=0;$i<$len;$i++){
$chr = $str[$i];
switch($chr){
case '<':
$ret .= '<';
break;
case '>':
$ret .= '>';
break;
case '"':
$ret .= '"';
break;
case '&':
$ret .= '&';
break;
case ' ':
$ret .= ' ';
break;
case chr(9):
$ret .= '    ';
break;
default:
$ret .= $chr;
break;
}
}

return $ret;
}

function emailcheck($email){
$ret=false;
if(strstr($email, '@' ) && strstr($email, '.')){
if(eregi("^([_a-z0-9]+([._a-z0-9-]+)*)@([a-z0-9]{2,}(.[a-z0-9-]{2,})*.[a-z]{2,3})$", $email)){
$ret=true;
}
}
return $ret;
}

function str2url($path){
return eregi_replace("%2f","/",urlencode($path));
}
?>