php把ubb代码转换成html

function  ubb($Text) 
  {
  $Text=htmlspecialchars($Text);
  $Text=stripslashes($Text); 
  $Text=ereg_replace(" ","
",$Text);
  $Text=ereg_replace(" ","
",$Text);
  $Text=nl2br($Text);
  $Text=preg_replace("/\t/is"," ",$Text);
  $Text=ereg_replace("  "," ",$Text); 
  $Text=preg_replace("/[h1](.+?)[/h1]/is","

\1

",$Text);
  $Text=preg_replace("/[h2](.+?)[/h2]/is","

\1

",$Text);
  $Text=preg_replace("/[h3](.+?)[/h3]/is","

\1

",$Text);
  $Text=preg_replace("/[h4](.+?)[/h4]/is","

\1

",$Text);
  $Text=preg_replace("/[h5](.+?)[/h5]/is","

\1

",$Text);
  $Text=preg_replace("/[h6](.+?)[/h6]/is","

\1

",$Text);
  $Text=preg_replace("/[center](.+?)[/center]/is","\1",$Text);
  $Text=preg_replace("/[big](.+?)[/big]/is","\1",$Text);
  $Text=preg_replace("/[small](.+?)[/small]/is","\1",$Text); 
  $Text=preg_replace("/[url](http://.+?)[/url]/is","\1",$Text);
  $Text=preg_replace("/[url](.+?)[/url]/is","http://\1",$Text);
  $Text=preg_replace("/[url=(http://.+?)](.*)[/url]/is","\2",$Text);
  $Text=preg_replace("/[url=(.+?)](.*)[/url]/is","\2",$Text);
  $Text=preg_replace("/[img](.+?)[/img]/is","",$Text);
  $Text=preg_replace("/[color=(.+?)](.+?)[/color]/is","\2",$Text);
  $Text=preg_replace("/[size=(.+?)](.+?)[/size]/is","\2",$Text);
  $Text=preg_replace("/[sup](.+?)[/sup]/is","^\1",$Text);
  $Text=preg_replace("/[sub](.+?)[/sub]/is","_\1",$Text);
  $Text=preg_replace("/[pre](.+?)[/pre]/is","",$Text);
  $Text=preg_replace("/[email](.+?)[/email]/is","\1",$Text);
  $Text=preg_replace("/[i](.+?)[/i]/is","\1",$Text);
  $Text=preg_replace("/[b](.+?)[/b]/is","\1",$Text);
  $Text=preg_replace("/[quote](.+?)[/quote]/is","

quote:\1

",  $Text);
  $pattern = "/([uploadimage])(d+),(.*)([/uploadimage])/U";
  $replacement = "";
  $Text =@preg_replace($pattern, $replacement, $Text);
  $str  = $Text;
  $pattern='#[flash=(d+),(d+)](.+)[/flash]#';
  $last = "

  [全屏欣赏　提醒：Flash中可能包含不安全内容]
  ";
  $Text= preg_replace($pattern, $last, $str); 
  $mpg ="   
  
  ";
  $Text =preg_replace('#[mp=(d+),(d+)](.+)[/mp]#', $mpg, $Text);     
  return @iconv('utf-8','gbk',@iconv('gbk','utf-8',$Text));
     
  }