<? 
 function bb_code($text)   
 {   
 $text=preg_replace('/  (.+)  /sU' , '<b>1</b>', $text);   
 $text=preg_replace('/  (.+)  /sU', '<i>1</i>', $text);   
 $text=preg_replace('/  (.+)  /sU', '<u>1</u>', $text);   
 $text=preg_replace('/  (.+)  /sU', '<s>1</s>', $text);   
 $text=preg_replace('/'.preg_quote('(.+)&#9 2;/sU', '<a href="1">2</a>', $text);   
 $text=preg_replace('/[url](.+)[/url]/sU', '<a href="1">1</a>', $text);   
 return $text;   
 } 
 ?>   

   echo bb_code('твой текс');