Smileys replacing core

I was looking at the code of smileys module and the way for smileys replacing is wors. Its too slow and not absolutely 100% working.

I with my friend wrote smileys replacing system for our old web, witch uses better technique.
I like to share with you Gurpartap Singh.

In DB is 2 tables - one for smiley image and second for smiley codes (each code is one record).
Than from tables are selected codes and replacing images into array sort by lenght of smiley code.

At the first wave are smileys code replaced by textual codes.
At the second wave are textual codes replaced by images - this was write for control of ammount replaced smileys.

Here is code preview:

function nahradit_smajly($text){
    global $UZIVATEL;
    // nepreje si nahrazova smajly
    if ($UZIVATEL[nahrazovat_smajly]==0) return $text;
    
    if (!$this->inicializace) $this->init();
    //$text = ":))text:))".$text;
    if ($this->pocet_smajlu > 0){
      global $smajly_kod_format,$smajly_kod,$smajly_repl_format,$smajly_repl_img;
      global $nahradil_pocet;
      // prevest na format ###SMAJL$iEND###
      $text = preg_replace($smajly_kod_format, $smajly_repl_format, $text);
      // vykonat nahrazeni smajlu (s hlidanim poctu)
      $nahradil_pocet = 0;
      $text = preg_replace("/###SMAJL([0-9]{1,4})END###/e", "special_nahrad_smajla('$1','$this->max')", $text);
      $this->nahradil = $nahradil_pocet;
      $this->nahradil_celkem += $nahradil_pocet;
    }
    return $text;
  } //end nahradit

function special_nahrad_smajla($smajl_index,$max){
                  global $smajly_kod,$smajly_repl_img;
                  global $nahradil_pocet;

                  if (($nahradil_pocet < $max)||($max < 0)){
                    $smajl = $smajly_repl_img[$smajl_index];
                    $nahradil_pocet++;
                  }else{ // jiz nepovadet nahrazeni
                    $smajl = $smajly_kod[$smajl_index];
                  }

                  return $smajl;
            }

There is no included function for DB selecting, but it is only for preview.

If you will be interested for this, I can provide more info.
I would write it my own, but I don't have much time :(