How to make a BBcode function

<?



function bbcode($text)  

{

  // To keep the spaces

  $text = str_replace('  ','&nbsp; ', stripslashes($text));



  // To jump a line

  $text = preg_replace("#n#i", '<br>', $text);



  // For pictures, one transform "http", this shouldn't be processed as a url

  if (eregi('[ picture=', $text))  {  $text = preg_replace("#[ picture=http://#i",'[ picture=', $text);  }



  // For videos, one transform "http", this shouldn't be processed as a url, it also transform a Youtube link to access directly to the video

  if (eregi('[ video=', $text))  {  $text = preg_replace("#[ video=http://#i",'[ video=', $text);  $text = preg_replace("#[ video=www.youtube.com/watch?v=#i",'[ video=www.youtube.com/v/', $text);  }



  // For url with tag

  if (eregi('[ /url]', $text))  {  $text = preg_replace("#url=http#i",'url=hzzp', $text);  $text = preg_replace("#url]http#i",'url]hzzp', $text);  $array_test_beg = split('[ url',strtolower($text)) + split('[ URL',strtolower($text));  $array_test_end = split('[ /url]',strtolower($text)) + split('[ /URL]',strtolower($text));  if (count($array_test_beg) == count($array_test_end)) {  if (eregi('[ url=', $text))  $text = preg_replace("#[ url=([ ^[ ]*) ?] ?([ ^]]*) ?[ /url]#i", '<a href="1" rel="nofollow" target="_blank" title="2">2</a>', $text);   if (eregi('[ url]', $text))  $text = preg_replace("#[ url]([ ^[ ]*)[ /url]#i", '<a href="1" rel="nofollow" target="_blank">1</a>', $text);  } }



  // For url without tag

  if (eregi('http://', $text))  {  $text = str_replace("&quot;"," ++^^$$&quot;",$text);  $text = preg_replace("#([ n ])?http://([ a-z0-9-=_%#$~%&;?./()+]+)#i", '1<a href="http://2" rel="nofollow" target="_blank">http://2</a>', $text);  $text = str_replace(" ++^^$$&quot;","&quot;",$text);  }



  // For url with tag

  if (eregi('hzzp', $text))  {  $text = preg_replace("#hzzp#i",'http', $text);  }





  if (eregi('[ ', $text))

  {



  // Colors

  if (eregi('[ /color]', $text))  {  $array_test_beg = split('[ color=',strtolower($text)) + split('[ COLOR=',strtolower($text));  $array_test_end = split('[ /color]',strtolower($text)) + split('[ /COLOR]',strtolower($text));  if (count($array_test_beg) == count($array_test_end)) {  $text = preg_replace("#[ color=red]#i", '<font color="#FF0000">', $text);    $text = preg_replace("#[ color=magenta]#i", '<font color="#FF00FF">', $text);    $text = preg_replace("#[ color=brown]#i", '<font color="#AA0000">', $text);    $text = preg_replace("#[ /color]#i", '</font>', $text);  } }



  // Font size

  if (eregi('[ /size]', $text))  {  $array_test_beg = split('[ size=',strtolower($text)) + split('[ SIZE=',strtolower($text));  $array_test_end = split('[ /size]',strtolower($text)) + split('[ /SIZE]',strtolower($text));  if (count($array_test_beg) == count($array_test_end)) {  $text = preg_replace("#[ size=([ 0-9])]([ ^]]*)[ /size]#i", '<font size="1">2</font>', $text); } }



  // Pictures

  if (eregi('[ /picture]', $text))  {  $array_test_beg = split('[ picture=',strtolower($text)) + split('[ PICTURE=',strtolower($text));  $array_test_end = split('[ /picture]',strtolower($text)) + split('[ /PICTURE]',strtolower($text));  if (count($array_test_beg) == count($array_test_end)) {  if (eregi('[ picture=', $text))  $text = preg_replace("#[ picture=([ ^[ ]*) ?] ?([ ^]]*) ?[ /pic]#i", '<img src="http://1" alt="2">', $text);  } }

  

  // Videos

  if (eregi('[ video=', $text))  {  $text = preg_replace("#[ video=([ a-z0-9-=_%#$~%&;:?./]+)]#i", '<object width="425" height="350"><param name="movie" value="http://1"></param><param name="allowFullScreen" value="true"></param><param name="wmode" value="transparent"></param><embed src="http://1" type="application/x-shockwave-flash" wmode="transparent" width="425" height="350" allowFullScreen="true"></embed></object>', $text);  }



  // Tables

  if (eregi('[ /table]', $text))  {  $array_test_beg = split('[ table',strtolower($text)) + split('[ TABLE',strtolower($text));  $array_test_end = split('[ /table]',strtolower($text)) + split('[ /TABLE]',strtolower($text));  if (count($array_test_beg) == count($array_test_end)) {  $text = preg_replace("#[ table=([ 0-9]+)]#i", '<table width="1">', $text);    $text = preg_replace("#[ table]#i",'<table>', $text);    $text = preg_replace("#[ /table]#i",'</table>', $text);    $text = preg_replace("#[ tr]#i",'<tr>', $text);    $text = preg_replace("#[ /tr]#i",'</tr>', $text);    $text = preg_replace("#[ td]#i",'<td>', $text);    $text = preg_replace("#[ /td]#i",'</td>', $text);  } }



  // Smilies, an example

  if (eregi('[ :', $text))  {  if (eregi('[ :)]',$text)) $text = preg_replace("#[ :)]#i", '<img src="/images/smilies/smile.gif">', $text);  }



  

  if (eregi('[ /b]', $text))  {  $array_test_beg = split('[ b]',strtolower($text)) + split('[ B]',strtolower($text));  $array_test_end = split('[ /b]',strtolower($text)) + split('[ /B]',strtolower($text));  if (count($array_test_beg) == count($array_test_end)) {  $text = preg_replace("#[ b]#i", '<b>', $text);    $text = preg_replace("#[ /b]#i", '</b>', $text);  } }

  if (eregi('[ /i]', $text))  {  $array_test_beg = split('[ i]',strtolower($text)) + split('[ I]',strtolower($text));  $array_test_end = split('[ /i]',strtolower($text)) + split('[ /I]',strtolower($text));  if (count($array_test_beg) == count($array_test_end)) {  $text = preg_replace("#[ i]#i", '<i>', $text);    $text = preg_replace("#[ /i]#i", '</i>', $text);  } }

  if (eregi('[ /u]', $text))  {  $array_test_beg = split('[ u]',strtolower($text)) + split('[ U]',strtolower($text));  $array_test_end = split('[ /u]',strtolower($text)) + split('[ /U]',strtolower($text));  if (count($array_test_beg) == count($array_test_end)) {  $text = preg_replace("#[ u]#i", '<u>', $text);    $text = preg_replace("#[ /u]#i", '</u>', $text);  } }



  if (eregi('[ /strike]', $text))  {  $array_test_beg = split('[ strike]',strtolower($text)) + split('[ STRIKE]',strtolower($text));  $array_test_end = split('[ /strike]',strtolower($text)) + split('[ /STRIKE]',strtolower($text));  if (count($array_test_beg) == count($array_test_end)) {  $text = preg_replace("#[ strike]#i", '<strike>', $text);    $text = preg_replace("#[ /strike]#i", '</strike>', $text);  } }



  if (eregi('[ /code]', $text))  {  $array_test_beg = split('[ code]',strtolower($text)) + split('[ CODE]',strtolower($text));  $array_test_end = split('[ /code]',strtolower($text)) + split('[ /CODE]',strtolower($text));  if (count($array_test_beg) == count($array_test_end)) {  $quote_color = '#FFE0B0';   $text = preg_replace("#[ code]#i",'<div style="color:#333333;background-color:'.$quote_color.';"><code>', $text);    $text = preg_replace("#[ /code]#i",'</code></div>', $text);  } }

  if (eregi('[ /quote]', $text))  {  $array_test_beg = split('[ quote]',strtolower($text)) + split('[ QUOTE]',strtolower($text));  $array_test_end = split('[ /quote]',strtolower($text)) + split('[ /QUOTE]',strtolower($text));  if (count($array_test_beg) == count($array_test_end)) {  $text = preg_replace("#[ quote]#i",'<div style="background-color:#F0F0F0;"><blockquote><font size="-1">', $text);    $text = preg_replace("#[ /quote]#i",'</font></blockquote></div>', $text);  } }



  if (eregi('[ /email]', $text))  {  $text = preg_replace("#[ email]#i",'', $text);    $text = preg_replace("#[ /email]#i",'', $text);  }



  }



  // Email addresses

  if (eregi('@', $text))  {  $text = preg_replace("#([ n ])?([ a-z0-9-_.]+)@([ a-z0-9-_.]+)#i", '12(at)3', $text);  }





  return($text);

}





function bbcode_title($text)  

{

  // No need to jump a line here

  $text = preg_replace("#([ nr]+)#i", ' ', stripslashes($text));



  // Remove tags  

  if (eregi('[ ', $text))  {  $text = preg_replace("#[ (.[ ^]]*)]#i", '', $text);  }



  // Email addresses

  if (eregi('@', $text))  {  $text = preg_replace("#([ n ])?([ a-z0-9-_.]+)@([ a-z0-9-_.]+)#i", '12(at)3', $text);  }

  

  return $text;

}



?>
How to make a BBcode function ?
