Mine

<?php
$str = "2mon1d2m14s"; //2months 1day 2minutes 14 seconds
echo $str;
/* All months are 30days ! */
if(strpos($str, "y")){
  $time += 12 * 30 * 24 * 60 * 60 * substr($str, 0, strpos($str, "y"));
  $str = substr($str, strpos($str, "mon")+1);
}
if(strpos($str, "mon")){
  $time += 30 * 24 * 60 * 60 * substr($str, 0, strpos($str, "mon"));
  $str = substr($str, strpos($str, "mon")+3);
}
if(strpos($str, "d")){
  $time += 24 * 60 * 60 * substr($str, 0, strpos($str, "d"));
  $str = substr($str, strpos($str, "d")+1);
}
if(strpos($str, "h")){
    $time += 60 * 60 * substr($str, 0, strpos($str, "h"));
  $str = substr($str, strpos($str, "h")+1);
}
if(strpos($str, "m")){
  $time += 60 * substr($str, 0, strpos($str, "h"));
  $str = substr($str, strpos($str, "m")+1);
}
if(strpos($str, "s")){
  $time += substr($str, 0, strpos($str, "h"));
  $str = substr($str, strpos($str, "s")+1);
}


echo $str;
echo "<br>";
echo $time*1000;
?>