Turn a String into a href:tel formatted link

gistfile1.aw

function parse_tel_number($tel_number) {

  $tel = preg_replace('/\s|\-|\(0\)+/' ,'' ,$tel_number); // Remove " ", -, "(0)"
  $tel = preg_replace('/^0/', '0044', $tel); // Prefix single zero string with 0044, defaults to England
  $tel = preg_replace('/\+/', '00', $tel); // Replace plus prefixed numbers with 00 to represent international
  $tel = preg_replace('/^([^0])/', "00$1", $tel); // Any numbers without 0 at the front are assumed to be international

  return "<a href=\"tel:$tel\">$tel_number</a>";
}