php function to find Relative time in year, month, week, day etc

function to find time passed or time left between two time.from & to are two arguments.

to is optional and defaults to current time stamp if not given

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1	echo time_relative("May 3, 1985 4:20 PM");

convert time to maonth days weeks

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function time_relative($from, $to = null) {  $to = (($to === null) ? (time()) : ($to));  $to = ((is_int($to)) ? ($to) : (strtotime($to)));  $from = ((is_int($from)) ? ($from) : (strtotime($from)));  $output = '';    $units = array  (   "year"   => 29030400, // seconds in a year   (12 months)   "month"  => 2419200,  // seconds in a month  (4 weeks)   "week"   => 604800,   // seconds in a week   (7 days)   "day"    => 86400,    // seconds in a day    (24 hours)   "hour"   => 3600,     // seconds in an hour  (60 minutes)    "minute" => 60,       // seconds in a minute (60 seconds)   "second" => 1         // 1 second  );    $diff = abs($from - $to);  $suffix = (($from > $to) ? ("left") : ("old"));    foreach($units as $unit => $mult)   if($diff >= $mult)   {    $and = (($mult != 1) ? ("") : ("and "));    $output .= ", ".$and.intval($diff / $mult)." ".$unit.((intval($diff / $mult) == 1) ? ("") : ("s"));    $diff -= intval($diff / $mult) * $mult;   }  $output .= " ".$suffix;  $output = substr($output, strlen(", "));    return $output; }