PHP自定义UBB

function ubb($Text) {
  $Text=trim($Text);
  //$Text=htmlspecialchars($Text);
//http://blog.ddian.cn
  $Text=preg_replace("/\t/is","  ",$Text);
  $Text=preg_replace("/[h1](.+?)[/h1]/is","<h1>\1</h1>",$Text);
  $Text=preg_replace("/[h2](.+?)[/h2]/is","<h2>\1</h2>",$Text);
  $Text=preg_replace("/[h3](.+?)[/h3]/is","<h3>\1</h3>",$Text);
  $Text=preg_replace("/[h4](.+?)[/h4]/is","<h4>\1</h4>",$Text);
  $Text=preg_replace("/[h5](.+?)[/h5]/is","<h5>\1</h5>",$Text);
  $Text=preg_replace("/[h6](.+?)[/h6]/is","<h6>\1</h6>",$Text);
  $Text=preg_replace("/[separator]/is","",$Text);
  $Text=preg_replace("/[center](.+?)[/center]/is","<center>\1</center>",$Text);
  $Text=preg_replace("/[url=http://([^[]*)](.+?)[/url]/is","<a href="http://\1" target=_blank>\2</a>",$Text);
  $Text=preg_replace("/[url=([^[]*)](.+?)[/url]/is","<a href="http://\1" target=_blank>\2</a>",$Text);
  $Text=preg_replace("/[url]http://([^[]*)[/url]/is","<a href="http://\1" target=_blank>\1</a>",$Text);
  $Text=preg_replace("/[url]([^[]*)[/url]/is","<a href="\1" target=_blank>\1</a>",$Text);
  $Text=preg_replace("/[img](.+?)[/img]/is","<img src=\1>",$Text);
  $Text=preg_replace("/[color=(.+?)](.+?)[/color]/is","<font color=\1>\2</font>",$Text);
  $Text=preg_replace("/[size=(.+?)](.+?)[/size]/is","<font size=\1>\2</font>",$Text);
  $Text=preg_replace("/[sup](.+?)[/sup]/is","<sup>\1</sup>",$Text);
  $Text=preg_replace("/[sub](.+?)[/sub]/is","<sub>\1</sub>",$Text);
  $Text=preg_replace("/[pre](.+?)[/pre]/is","<pre>\1</pre>",$Text);
  $Text=preg_replace("/[email](.+?)[/email]/is","<a href='mailto:\1'>\1</a>",$Text);
  $Text=preg_replace("/[colorTxt](.+?)[/colorTxt]/eis","color_txt('\1')",$Text);
  $Text=preg_replace("/[emot](.+?)[/emot]/eis","emot('\1')",$Text);
  $Text=preg_replace("/[i](.+?)[/i]/is","<i>\1</i>",$Text);
  $Text=preg_replace("/[u](.+?)[/u]/is","<u>\1</u>",$Text);
  $Text=preg_replace("/[b](.+?)[/b]/is","<b>\1</b>",$Text);
  $Text=preg_replace("/[quote](.+?)[/quote]/is"," <p class='quote'><h5>引用:</h5><blockquote>\1</blockquote></p>", $Text);
  $Text=preg_replace("/[code](.+?)[/code]/eis","highlight_code('\1')", $Text);
  $Text=preg_replace("/[php](.+?)[/php]/eis","highlight_code('\1')", $Text);
  $Text=preg_replace("/[sig](.+?)[/sig]/is","<p class='sign'>\1</p>", $Text);
  $Text=preg_replace("/\n/is","<br/>",$Text);
  return $Text;
}