[joeldg]

First make an array of your replacements. would most likely be coming from a DB
Then loop through them..
i.e.:

PHP Code:

$repl = array(

    "[br]" => "<br>",

    "[hr]" => "<hr>"

); // etc....



function codigo($texto){

global $repl;

   while(list($key,$val)=each($repl)){

    $texto = str_replace($key,$val,$texto);

   }//wend



}//end function

#...  etc rest of function 

pretty easy...
cheers