php datediff获取天数,php实现的DateDiff和DateAdd时间函数代码分享_php技巧

扩展php中的时间函数DateDiff和DateAdd

function DateDiff($part, $begin, $end)

{

$diff = strtotime($end) - strtotime($begin);

switch($part)

{

case "y": $retval = bcdiv($diff, (60 * 60 * 24 * 365)); break;

case "m": $retval = bcdiv($diff, (60 * 60 * 24 * 30)); break;

case "w": $retval = bcdiv($diff, (60 * 60 * 24 * 7)); break;

case "d": $retval = bcdiv($diff, (60 * 60 * 24)); break;

case "h": $retval = bcdiv($diff, (60 * 60)); break;

case "n": $retval = bcdiv($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;

}

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