PHP日期比较函数

<?php
echo datediff('d', '2010-03-01', date("Y-m-d"), false); 
//日期比较函数
function datediff($interval, $datefrom, $dateto, $using_timestamps = false) { 
     /* 
     $interval can be: 
     yyyy - Number of full years 
     m - Number of full months 
     d - Number of full days 
     w - Number of full weekdays 
     ww - Number of full weeks 
     h - Number of full hours 
     n - Number of full minutes 
     s - Number of full seconds (default) 
     */
     if (!$using_timestamps) { 
         $datefrom = strtotime($datefrom, 0); 
         $dateto = strtotime($dateto, 0); 
     } 
     $difference = $dateto - $datefrom; // Difference in seconds 
     switch($interval) { 
     case 'yyyy': // Number of full years 
         $years_difference = floor($difference / 31536000); 
         if (mktime(date("H", $datefrom), date("i", $datefrom), date("s", $datefrom), date("n", $datefrom), date("j", $datefrom), date("Y", $datefrom)+$years_difference) > $dateto) { 
             $years_difference--; 
         } 
         if (mktime(date("H", $dateto), date("i", $dateto), date("s", $dateto), date("n", $dateto), date("j", $dateto), date("Y", $dateto)-($years_difference+1)) > $datefrom) { 
             $years_difference++; 
         } 
         $datediff = $years_difference; 
         break; 
     case "m": // Number of full months 
         $months_difference = floor($difference / 2678400); 
         while (mktime(date("H", $datefrom), date("i", $datefrom), date("s", $datefrom), date("n", $datefrom)+($months_difference), date("j", $dateto), date("Y", $datefrom)) < $dateto) { 
             $months_difference++; 
         } 
         $months_difference--; 
         $datediff = $months_difference; 
         break; 
     case "d": // Number of full days 
         $datediff = floor($difference / 86400); 
         break; 
     case "w": // Number of full weekdays 
         $days_difference = floor($difference / 86400); 
         $weeks_difference = floor($days_difference / 7); // Complete weeks 
         $first_day = date("w", $datefrom); 
         $days_remainder = floor($days_difference % 7); 
         $odd_days = $first_day + $days_remainder; // Do we have a Saturday or Sunday in the remainder? 
         if ($odd_days > 7) { // Sunday 
             $days_remainder--; 
         } 
         if ($odd_days > 6) { // Saturday 
             $days_remainder--; 
         } 
         $datediff = ($weeks_difference * 5) + $days_remainder; 
         break; 
     case "ww": // Number of full weeks 
         $datediff = floor($difference / 604800); 
         break; 
     case "h": // Number of full hours 
         $datediff = floor($difference / 3600); 
         break; 
     case "n": // Number of full minutes 
         $datediff = floor($difference / 60); 
         break; 
     default: // Number of full seconds (default) 
         $datediff = $difference; 
         break; 
     } 
     return $datediff; 
}
?>

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