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function ascii2html($s){
 $s = htmlentities($s);
 // try and split the text by a double line break
 $paragraphs = split("\n\n",$s);
 if(count($paragraphs)<2){
  // if there isn't enough array there then try and split it by single
  $paragraphs = split("\n",$s);         
 };
 for($i = 0,$j = count($paragraphs);$i < $j;$i++){
  // create links around URLs
  $paragraphs[$i] = preg_replace('/((ht|f)tp:\/\/[^\s&]+)/','<a href="$1">$1</a>',$paragraphs[$i]);
  // create links around email addresses
  $paragraphs[$i] = preg_replace('/[^@\s]+@([-a-z0-9]+\.)+[a-z]{2,}/i','<a href="mailto:$0">$0</a>',$paragraphs[$i]);
  // make paragraph
  $paragraphs[$i] = '<p>'.$paragraphs[$i].'</p>';
 };
 // join all paragraphs and return
 return join("\n",$paragraphs);
}

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$text = "this is some text
that splits across several
lines and
has some links like this 
one here http://www.hashbangcode.com which
will be used to create a bunch of html";