Code sharing of DateDiff and DateAdd time functions implemented by php

This article mainly introduces the code sharing of the DateDiff and DateAdd time functions implemented by php. DateDiff is used to calculate the two time intervals, and DateAdd is used to add the two time periods, for more information about how to extend the time functions DateDiff and DateAdd in php, see.

function DateDiff($part, $begin, $end){$diff = strtotime($end) - strtotime($begin);switch($part){case "y": $retval = bcp($diff, (60 * 60 * 24 * 365)); break;case "m": $retval = bcp($diff, (60 * 60 * 24 * 30)); break;case "w": $retval = bcp($diff, (60 * 60 * 24 * 7)); break;case "d": $retval = bcp($diff, (60 * 60 * 24)); break;case "h": $retval = bcp($diff, (60 * 60)); break;case "n": $retval = bcp($diff, 60); break;case "s": $retval = $diff; break;}return $retval;}function DateAdd($part, $number, $date){$date_array = getdate(strtotime($date));$hor = $date_array["hours"];$min = $date_array["minutes"];$sec = $date_array["seconds"];$mon = $date_array["mon"];$day = $date_array["mday"];$yar = $date_array["year"];switch($part){case "y": $yar += $number; break;case "q": $mon += ($number * 3); break;case "m": $mon += $number; break;case "w": $day += ($number * 7); break;case "d": $day += $number; break;case "h": $hor += $number; break;case "n": $min += $number; break;case "s": $sec += $number; break;}return date("Y-m-d H:i:s", mktime($hor, $min, $sec, $mon, $day, $yar));}Function DateAdd($part, $n, $date){switch($part){case "y": $val = date("Y-m-d H:i:s", strtotime($date ." +$n year")); break;case "m": $val = date("Y-m-d H:i:s", strtotime($date ." +$n month")); break;case "w": $val = date("Y-m-d H:i:s", strtotime($date ." +$n week")); break;case "d": $val = date("Y-m-d H:i:s", strtotime($date ." +$n day")); break;case "h": $val = date("Y-m-d H:i:s", strtotime($date ." +$n hour")); break;case "n": $val = date("Y-m-d H:i:s", strtotime($date ." +$n minute")); break;case "s": $val = date("Y-m-d H:i:s", strtotime($date ." +$n second")); break;}return $val;}