<?
  //link (http, www, ftp, email)
  $patterns = array ('#(^|[^\"\']\s)(www|WWW)\.([^\s<>\.]+)\.([^\"\'\s <>]+)#sm',
    '#(^|[^\"\'=]{1})(http|HTTP|ftp)(s|S)?://([^\s<>\.]+)\.([^\"\'\s\)<>]+)#sm',
    '/([a-z0-9&\-_.]+?)@([\w\-]+\.([\w\-\.]+\.)*[\w]+)/i'
    );
  $replace = array ('\1<a href="http://\2.\3.\4" target="_blank">\2.\3.\4</a>',
    '\1<a href="\2\3://\4.\5" target="_blank">\2\3://\4.\5</a>',
    '<a href=\"mailto:\1@\2\">\1@\2</a>'
    );
  $temp = preg_replace($patterns, $replace, $temp);
?>