Twitify Links - converts twitter type text to links

twittify.php

<?php
  // Parse Twitter nicks/lists to urls
  
  // Internal routine
  // This has a couple of functions
  // TwittifyLinks() - returns True if template is set, otherwise false
  // TwittifyLinks($arr,true) - $arr is a 2 element array, each holding a template for usernames/groups
  // TwittifyLinks($twit) - $twit is the user/group to convert to a link
  function TwittifyLinks($var=null,$set=false)
  {
      static $template=null;
      if($set==true)
      {
          if(is_array($var) && count(($var)==2))
          {
            $template=$var;
            return true;
          }
          return false;
      }
      if($set==false && $var==null)
      {
          return ($template!=null)?true:false;
      }
      if($template==null)
        return false;
      $type=substr($var,0,1)=='@'?0:1;
      $name=strtolower(substr($var,1));
      return str_replace(array('(name)','(twit)'),array($name,$var),$template[$type]);
  }
  // Internal
  // This routine just strips the array and Twittifyes the user/group
  function TwittifyReplace($matches)
  {
      return TwittifyLinks($matches[0]);
  }
  // Twittify
  // $text - string to search for twit links
  // $template - link template
  function Twittify($text,$template=null)
  {
      if(($template==null && !TwittifyLinks()) || ($template!=null && !is_array($template))
        || (is_array($template) && count($template)!=2))
        $template=array('<a href="/users/(name)">(twit)</a>','<a href="/group/(name)">(twit)</a>');
      if($template!=null)
        TwittifyLinks($template,true);
      return preg_replace_callback('/(?<=^|\s)[#@][a-z0-9-_]{4,15}(?![a-z0-9-_])/ismx','TwittifyReplace',$text);
  }
  
  
  // Tests
  $tests=array(
    'hello friends, I\'m listening @daftPunk and you?',
    '@Overlord, I Have no clue why ya havent died yet',
    '@Gem Took her shirt off in front of @Laffin',
    '@April!!!!!!!!! *HUGS* LTNS',
    '@Spyke Remember to check out #Coders'
    
  );
  foreach($tests as $test)
  {
      echo Twittify($test). '<br>'.PHP_EOL;
  }
?>