php UBB 解析实现代码

/**
+----------------------------------------------------------
* ubb 解析
+----------------------------------------------------------
* @return string
+----------------------------------------------------------
*/
function ubb($text) {
$text=trim($text);
$text=ereg_replace("n","<br>",$text);
$text=preg_replace("/\t/is"," ",$text);
$text=preg_replace("/[hr]/is","<hr>",$text);
$text=preg_replace("/[separator]/is","<br/>",$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);
$text=preg_replace("/[center](.+?)[/center]/is","<center>\1</center>",$text);
//$text=preg_replace("/[url=([^[]*)](.+?)[/url]/is","<a href=\1 target='_blank'>\2</a>",$text);
$text=preg_replace("/[url](.+?)[/url]/is","<a href="\1" target='_blank'>\1</a>",$text);
$text=preg_replace("/[url=(http://.+?)](.+?)[/url]/is","<a href='\1' target='_blank'>\2</a>",$text);
$text=preg_replace("/[url=(.+?)](.+?)[/url]/is","<a href=\1>\2</a>",$text);
$text=preg_replace("/[img](.+?)[/img]/is","<img src=\1>",$text);
$text=preg_replace("/[imgs(.+?)](.+?)[/img]/is","<img \1 src=\2>",$text);
$text=preg_replace("/[color=(.+?)](.+?)[/color]/is","<font color=\1>\2</font>",$text);
$text=preg_replace("/[colortxt](.+?)[/colortxt]/eis","color_txt('\1')",$text);
$text=preg_replace("/[style=(.+?)](.+?)[/style]/is","<div class='\1'>\2</div>",$text);
$text=preg_replace("/[size=(.+?)](.+?)[/size]/is","<font size=\1>\2</font>",$text);
$text=preg_replace("/[sup](.+?)[/sup]/is","^\1",$text);
$text=preg_replace("/[sub](.+?)[/sub]/is","_\1",$text);
$text=preg_replace("/[pre](.+?)[/pre]/is","<pre>\1</pre>",$text);
$text=preg_replace("/[emot](.+?)[/emot]/eis","emot('\1')",$text);
$text=preg_replace("/[email](.+?)[/email]/is","<a href='mailto:\1'>\1</a>",$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","<blockquote>引用:<div style='border:1px solid silver;background:#efffdf;color:#393939;padding:5px' >\1</div></blockquote>", $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","<div style='text-align: left; color: darkgreen; margin-left: 5%'><br><br>--------------------------<br>\1<br>--------------------------</div>", $text);
return $text;
}