03c06-1.php

来自「介绍PHP5的给类型函数应用」· PHP 代码 · 共 57 行

<?php
// Set the default timezone to US/Eastern time:
date_default_timezone_set('US/Eastern');

// This function will count the number of business days between two dates
function count_business_days($a, $b) {
	// First, sort these.  We need to know which one comes first
	if ($a < $b) {
		$first = $a;
		$second = $b;
	} else {
		$first = $b;
		$second = $a;
	}
		
	// Break these timestamps up into their constituent parts:
    $f = getdate($first);
    $s = getdate($second);
	
	// Calculate the number of business days in the first week left.
	// Do this by subtracting the number of the day of the week from Friday
    $f_days = 5 - $f['wday'];
    // If it was Saturday or Sunday you will get a -1 or 5 but we want 0
    if (($f_days == 5) || ($f_days < 0)) { $f_days = 0; }

    // Do the same for the second week except count to the beginning of 
	// the week.  However, make sure that Saturday only counts as 5
    $s_days = ($s['wday'] > 5) ? 5 : $s['wday'];
    
    // Calculate the timestamp of midday, the Sunday after the first date:
    $f_sunday = mktime(12, 0, 0, $f['mon'], 
					$f['mday'] + ((7 - $f['wday']) % 7), $f['year']);
	
	// And the timestamp of midday, the Sunday before the second date:
    $s_sunday = mktime(12, 0, 0, $s['mon'], 
					$s['mday'] - $s['wday'], $s['year']);

    // Calculate the full weeks between these two dates by substracting 
	//  them, then dividing by the seconds in a week.  You need to round
	//  this afterwards to always ensure an even number.  Otherwise
	//  daylight savings time can offset the calculation.
    $weeks = round(($s_sunday - $f_sunday) / (3600*24*7));

	// Return the number of days by multiplying weeks by 5 and adding 
	//  the extra days:
    return ($weeks * 5) + $f_days + $s_days;
}

// Try a couple of examples:
$date1 = strtotime('12/3/1973 8:13am');
$date2 = strtotime('1/15/1974 10:15pm');
$date3 = strtotime('2/14/2005 1:32pm');

// Calculate the business days between, They are: 31 & 8109
echo "<p>There are ", count_business_days($date1, $date2), " days.</p>";
echo "<p>There are ", count_business_days($date2, $date3), " days.</p>";
?>