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# 如何寫一支計算天數間的ＰＨＰ程式

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function datediff(\$interval, \$datefrom, \$dateto, \$using_timestamps = false) {

/*

\$interval can be:

yyyy - Number of full years

q - Number of full quarters

m - Number of full months

y - Difference between day numbers

(eg 1st Jan 2004 is "1", the first day. 2nd Feb 2003 is "33". The datediff is "-32".)

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);

} // End of if (!\$using_timestamps)

\$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 "q": // Number of full quarters

\$quarters_difference = floor(\$difference / 8035200);

while (mktime(date("H", \$datefrom), date("i", \$datefrom), date("s", \$datefrom), date("n", \$datefrom)+(\$quarters_difference*3), date("j", \$dateto), date("Y", \$datefrom)) < \$dateto) {

\$months_difference++;

}

\$quarters_difference--;

\$datediff = \$quarters_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 'y': // Difference between day numbers

\$datediff = date("z", \$dateto) - date("z", \$datefrom);

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;

} // End of switch(\$interval)

return \$datediff;

} // End of function datediff(\$interval, \$datefrom, \$dateto, \$using_timestamps = false)

例如２００５／１／３～２００６／８／２５ datediff('d', '2005/1/3', '2006/8/25', false)

Source(s): 網路找來的Code