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一个用PHP实现的UBB类！
<?php
  /*
  如有转载，请注明作者

  作者: 何志强
  文件: ubb.php
  备注: 说是改进，其实核心函数parse()已经完全重写了，而且思路也是不相同的。
  不过仍是受何志强的例子的启发，而且测试的例子还有URLCHECK等几个函数也是沿用的何志强的程序，谢谢何志强。
  目前还没有颜色的功能，但我会加入的。
  假如在程序上有什么BUG或不便的地方，请给我MAIL。
  谢谢！
  改进功能:
  对字符串进行UBB编码,该类目前只支持下列几个简朴且实用的编码:
  1. URL裢接
  http://www.phpexe.com/
  http://头可以不需要
  如phpexe.com也是可以的。
  2. Email裢接
  demo@163.net
  3. 图片裢接

  同URL链接相同，前面的http也可以不要。
  4. 文字方面
  粗体字
  斜体字
  加下划线

  1号标题字
  ...
  6号标题字



  [tt][/tt]
  [s][/s]

  [em][/em]
  [strong][/strong]
  [code][/code]
  [samp][/samp]
  [kbd][/kbd]
  [var][/var]
  [dfn][/dfn]
  [cite][/cite]



  注重以下几点:
  1. url,email,img等标签是不分大小写的.
  2. 在标签中不答应有TAB键出现，但空格答应。
  3. 该类要调用htmlencode,htmlencode4textarea,emailcheck函数和urlcheck类.
  4. 修改后支持嵌套，但url,email,img这三个标签不是答应嵌套的。
  技术资料:
  Ultimate Bulletin Board
  http://www.ultimatebb.com/
  What is UBB Code
  http://www.scriptkeeper.com/ubb/ubbcode.html
  */

  include(\"urlcheck.php\");
  include(\"otherfunc.php\"); //这两个文件的内容，附在最后。

  //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; //假如没有，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.\"<br>\";
  return $parse;//假如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<br>\";
  $ret .= $parse2.\\\'[\\\'.$tag_start.\\\']\\\';
  continue;//假如是不支持的标记
  }

  //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;//假如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.\\\'>\\\'.$value.\\\'</\\\'.$end.\\\'>\\\';
  }

  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 \\\'<a href=\"\\\'.$trim_value.\\\'\" \\\'.$this->attr_url.\\\'>\\\'.$value.\\\'</a>\\\';
  else return \\\'[\\\'.$start.\\\']\\\'.$value.\\\'[/\\\'.$end.\\\']\\\';
  }

  function email($start,$end,$value){
  if(emailcheck($value)) return \\\'<a href=\"mailto:\\\'.$value.\\\'\">\\\'.$value.\\\'</a>\\\';
  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($trim_value)))
  return \\\'<img src=\"\\\'.$trim_value.\\\'\"></img>\\\';
  else return \\\'[\\\'.$start.\\\']\\\'.$value.\\\'[/\\\'.$end.\\\']\\\';
  }
  }

  //测试
  echo \\\'<html>\\\';
  echo \\\'<head><title>测试</title></head>\\\';
  echo \\\'<body>\\\';
  echo \\\'<form action=\"\\\'.str2url($PATH_INFO).\\\'\" method=\"post\">\\\';
  echo \\\'<textarea cols=\"100\" rows=\"10\" name=\"ubb\">\\\'.htmlencode4textarea($ubb).\\\'</textarea><br>\\\';
  echo \\\'<input type=\"submit\" value=\"转变\">\\\';
  echo \\\'</form>\\\';

  if(isset($ubb)){
  $ubbcode = new ubbcode(\\\'target=\"_blank\"\\\');
  echo \\\'<hr>\\\'.$ubbcode->parse($ubb);
  }

  echo \\\'</body>\\\';
  echo \\\'</html>\\\';

  ?>

  文件urlcheck.php的内容
  <?php
  //urlcheck.php
  class urlcheck{
  var $regex = array(//协议名(注重在这里必须写成小写) => 对应的正则表达式
  \\\'ftp\\\' => \\\'$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 $lowalpha;
  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 $toplabel;
  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
  <?php
  //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 .= \\\'<br>\\\';
  $nl = true;
  }
  break;
  case chr(13):
  if($nl) $nl = false;
  else{
  $ret .= \\\'<br>\\\';
  $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));
  }
  ?>

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