Je n'arrive pas à comprendre ce bout de code...

function convert_message($message,$affichesmiley)
{
  $debut_cite = "<br/>
                <table width=\"85%\" cellspacing=\"0\" border=\"1px\" cellpadding=\"0\" bordercolor=\"#000000\">
                <tr>
                  <td>
                    <span style=\"font-size:10px\">";
  $fin_cite = "</span><br/>
                  </td>
                </tr>
                </table>";
  $message = eregi_replace("\[cite:(.+)\](.+)\[/cite\]", "Citation de \\1 $debut_cite \\2 $fin_cite ", $message );
  if($affichesmiley=="true")
  {
    $fp = file("smileys.txt");
    $i=0;
    $fin = sizeof($fp);
    while($i!=$fin)
    {
      $chaine = $fp[$i];
      $image2 = stristr($chaine, " ** ");
      $image = str_replace(" ** ","",$image2);
      $symbole = str_replace($image2 ,"", $chaine);
      $image = trim($image);
      $message = str_replace($symbole,"<img src=\"smiley/$image\" alt=\"$image\">",$message);
      $i++;
    };
  };
/* Au cas ou la nouvelle version ne marche pas, cette versionmarche un peu :D
  $message = eregi_replace("\[img\]([^[]*)\[/img\]", '<IMG SRC=\\1 ALT=\\1>', $message );
  $message = eregi_replace("\[b\]([^[]*)\[/b\]", '<B>\\1</B>', $message );
  $message = eregi_replace("\[i\]([^[]*)\[/i\]", '<i>\\1</i>', $message );
  $message = eregi_replace("\[u\]([^[]*)\[/u\]", '<u>\\1</u>', $message );
  $message = preg_replace("/([\w\.]+)(@)([\w\.]+)/i", "<a href=\"mailto:$0\">$0</a>", $message);
  $message = preg_replace("/([^\w\/])(www\.[a-z0-9\-]+\.[a-z0-9\-]+)/i","$1http://$2",$message);
  $message = preg_replace("/^(=)([\w]+:\/\/[\w-?&;#~=\.\/\@]+[\w\/])/i","<A TARGET=\"_blank\" HREF=\"$1\">$1</A>",$message);
*/
  $message = eregi_replace("\[b\]([^[]*)\[/b\]", '<b>\\1</b>', $message );
  $message = eregi_replace("\[i\]([^[]*)\[/i\]", '<i>\\1</i>', $message );
  $message = eregi_replace("\[u\]([^[]*)\[/u\]", '<u>\\1</u>', $message );
  $message = preg_replace("/([\w\.\-]+)(@)([\w\.\-]+)/i", "<a href=\"mailto:$0\">$0</a>", $message);
  $message = preg_replace("/([^\w\/])(www\.[a-z0-9\-]+\.[a-z0-9\-]+)/i","$1http://$2",$message);
  $message = preg_replace("/([\w]+:\/\/[\w-?&;#~=\.\/\@]+[\w\/])/i", "<a target=\"_blank\" href=\"$1\">$1</a>",$message);
  $message = eregi_replace("\[img\]<a target=\"_blank\" href=\"([^[]*)\">([^[]*)</a>\[/img\]", '<img src=\\2 ALT="\\2">', $message );
  $message = eregi_replace("\[img\]([^[]*)\[/img\]", '<img src=\\1 ALT="\\1">', $message );

  return $message;
};

  $message = eregi_replace("\[cite:(.+)\](.+)\[/cite\]", "Citation de \\1 $debut_cite \\2 $fin_cite ", $message );

\[cite:(.+)\](.+)\[/cite\]",

string  eregi_replace ( string pattern , string replacement , string string)

$message = eregi_replace("\[cite:(.+)\](.+)\[/cite\]", "Citation de \\1 $debut_cite \\2 $fin_cite ", $message );