a simple method for converting minecraft colourcodes into HTML

colors.css

.c0
{
    color : #000000;
}

.c1
{
    color : #0000AA;
}

.c2
{
    color : #00AA00;
}

.c3
{
    color : #00AAAA;
}

.c4
{
    color : #AA0000;
}

.c5
{
    color : #AA00AA;
}

.c6
{
    color : #FFAA00;
}

.c7
{
    color : #AAAAAA;
}

.c8
{
    color : #555555;
}

.c9
{
    color : #5555FF;
}

.ca
{
    color : #55FF55;
}

.cb
{
    color : #55FFFF;
}

.cc
{
    color : #FF5555;
}

.cd
{
    color : #FF55FF;
}

.ce
{
    color : #FFFF55;
}

.cf
{
    color : #FFFFFF;
}

.cl
{
    font-weight : 900;
}

.co
{
    font-style : italic;
}

.cn
{
    text-decoration : underline;
}

.cm
{
    text-decoration : line-through;
}

.cr
{
    color           : #FFFFFF;
    font-weight     : normal;
    font-style      : normal;
    text-decoration : none;
}

colors.php

<?php
  /* 
    Copyright (c) 2013 Luuk Jacobs.  
    You may not copy or redistribute this work without written consent of the copyright holder.
    You may not use this work commercially.
    You are required to give credit when you are releasing/distributing anything that uses this work.
  */

  /**
   *
   * @param $matches
   * @return string
   */
  function allCallback( $matches )
  {
    $matches[1] = strtolower( $matches[1] );
    $bindings   = array(
      0   => 'c0',
      1   => 'c1',
      2   => 'c2',
      3   => 'c3',
      4   => 'c4',
      5   => 'c5',
      6   => 'c6',
      7   => 'c7',
      8   => 'c8',
      9   => 'c9',
      'a' => 'ca',
      'b' => 'cb',
      'c' => 'cc',
      'd' => 'cd',
      'e' => 'ce',
      'f' => 'cf',
      'r' => 'cr',
    );
    $bold       = array(
      'l' => 'cl',
      'r' => 'cr',
    );
    $italic     = array(
      'o' => 'co',
      'r' => 'cr',
    );
    $decoration = array(
      'n' => 'cn',
      'm' => 'cm',
      'r' => 'cr',
    );
    $fg         = isset( $bindings[$matches[1]] ) ? $bindings[$matches[1]] : 'cr';
    $bo         = isset( $bold[$matches[1]] ) ? $bold[$matches[1]] : 'cr';
    $it         = isset( $italic[$matches[1]] ) ? $italic[$matches[1]] : 'cr';
    $de         = isset( $decoration[$matches[1]] ) ? $decoration[$matches[1]] : 'cr';

    if ( isset( $bindings[$matches[1]] ) )
    {
      return "<span class='$fg'>" . $matches[2] . "</span>";
    }
    if ( isset( $bold[$matches[1]] ) )
    {
      return "<span class='$bo'>" . $matches[2] . "</span>";
    }
    if ( isset( $italic[$matches[1]] ) )
    {
      return "<span class='$it'>" . $matches[2] . "</span>";
    }
    if ( isset( $decoration[$matches[1]] ) )
    {
      return "<span class='$de'>" . $matches[2] . "</span>";
    }

    return "";
  }

  /**
   * @param $matches
   * @return string
   */
  function formattingCallback( $matches )
  {
    $matches[1] = strtolower( $matches[1] );
    $bold       = array(
      'l' => 'cl',
      'r' => 'cr',
    );
    $italic     = array(
      'o' => 'co',
      'r' => 'cr',
    );
    $decoration = array(
      'n' => 'cn',
      'm' => 'cm',
      'r' => 'cr',
    );
    $bo         = isset( $bold[$matches[1]] ) ? $bold[$matches[1]] : 'cr';
    $it         = isset( $italic[$matches[1]] ) ? $italic[$matches[1]] : 'cr';
    $de         = isset( $decoration[$matches[1]] ) ? $decoration[$matches[1]] : 'cr';
    if ( isset( $bold[$matches[1]] ) )
    {
      return "<span class='$bo'>";
    }
    if ( isset( $italic[$matches[1]] ) )
    {
      return "<span class='$it'>";
    }
    if ( isset( $decoration[$matches[1]] ) )
    {
      return "<span class='$de'>";
    }

    return "";
  }

  /**
   * @param $text
   * @return string
   */
  function mctohtml( $text )
  {
    $text      = preg_replace( '(\n)', "", $text );
    $text      = preg_replace( '/§([k-or0-9a-f])/i', "&$1", $text );
    $text      = "&f" . trim( $text ) . "&r";
    $colorSplit     = preg_split( "/(&[k-or0-9a-f])/i", $text, NULL, PREG_SPLIT_DELIM_CAPTURE );
    $spans    = 0;
    $partialHTML = "";
    foreach ( $colorSplit as $string )
    {
      switch ( $string )
      {
        case'&l':
          $spans++;
          $string = preg_replace_callback( '/&(l)/i', "formattingCallback", $string );
          break;
        case'&m':
          $spans++;
          $string = preg_replace_callback( '/&(m)/i', "formattingCallback", $string );
          break;
        case'&n':
          $spans++;
          $string = preg_replace_callback( '/&(n)/i', "formattingCallback", $string );
          break;
        case'&o':
          $spans++;
          $string = preg_replace_callback( '/&(o)/i', "formattingCallback", $string );
          break;
      }
      $span   = str_repeat( "</span>", $spans );
      $string = preg_replace( "/(&[0-9a-fr])/i", $span . '$1', $string );

      $partialHTML .= $string;
    }


    $html  = preg_replace_callback( '/&([0-9a-fr])((.*?)((?=(&[0-9a-fr]))))/i', 'allCallback', $partialHTML );
    $html  = preg_replace( '(&r|&k)', '', $html );
    $html .= "<br />";

    return $html;
  }


  $text = "§6An &lexample &fof §4colourcodes §l§n§obeing§4 changed"
  print mctohtml($text);