/**
* Calculates the number of days between first and second parameter
*
* @param int Date 1
* @param int Date 2
* @return int Number of days
*
* @author Former03 GmbH :: Florian Lippert <*****@*****.**>
*/
function calculateDayDifference($begin, $end)
{
$daycount = 0;
$begin = transferDateToArray($begin);
$end = transferDateToArray($end);
$direction = 1;
// Sanity check, if our given array is in the right format
if (checkDateArray($begin) === true && checkDateArray($end) === true) {
if (strtotime($end['y'] . '-' . $end['m'] . '-' . $end['d']) < strtotime($begin['y'] . '-' . $begin['m'] . '-' . $begin['d'])) {
$tmp = $end;
$end = $begin;
$begin = $tmp;
unset($tmp);
$direction = -1;
}
$yeardiff = (int) $end['y'] - (int) $begin['y'];
$monthdiff = (int) $end['m'] + 12 * $yeardiff - (int) $begin['m'];
for ($i = 0; $i < abs($monthdiff); $i++) {
$daycount += getDaysForMonth($begin['m'] + $i, $begin['y']);
}
$daycount += $end['d'] - $begin['d'];
$daycount *= $direction;
}
return $daycount;
}
/**
* Manipulates a date, like adding a month or so and correcting it afterwards
* (2008-01-33 -> 2008-02-02)
*
* @param array The date array
* @param string The operation, may be '+', 'add', 'sum' or '-', 'subtract', 'subduct'
* @param int Number if days/month/years
* @param string Either 'y', 'm', 'd', depending on what part to change.
* @param array A valid date array with original date, mandatory for more than one manipulation on same date.
* @return date The manipulated date array
*
* @author Former03 GmbH :: Florian Lippert <*****@*****.**>
*/
function manipulateDate($date, $operation, $count, $type, $original_date = null)
{
$newdate = $date;
$date = transferDateToArray($date);
if (checkDateArray($date) === true && isset($date[$type])) {
switch ($operation) {
case '+':
case 'add':
case 'sum':
$date[$type] += (int) $count;
break;
case '-':
case 'subtract':
case 'subduct':
$date[$type] -= (int) $count;
break;
}
if ($original_date !== null && ($original_date = transferDateToArray($original_date)) !== false && $type == 'm') {
if ($original_date['d'] > getDaysForMonth($date['m'], $date['y'])) {
$date['d'] = getDaysForMonth($date['m'], $date['y']) - (getDaysForMonth($original_date['m'], $original_date['y']) - $original_date['d']);
} else {
$date['d'] = $original_date['d'];
}
}
while (checkDateArray($date) === false) {
if ($date['d'] > getDaysForMonth($date['m'], $date['y'])) {
$date['d'] -= getDaysForMonth($date['m'], $date['y']);
$date['m']++;
}
if ($date['d'] < 1) {
$date['m']--;
$date['d'] += getDaysForMonth($date['m'], $date['y']);
// Adding here, because date[d] is negative
}
if ($date['m'] > 12) {
$date['m'] -= 12;
$date['y']++;
}
if ($date['m'] < 1) {
$date['y']--;
$date['m'] += 12;
}
}
$newdate = $date['y'] . '-' . $date['m'] . '-' . $date['d'];
}
return $newdate;
}
/**
* Due to the weirdness in our calendar we need a special
* method for gathering the number days in an interval.
*
* @param int Length of interval
* @param string Type of interval, might be 'd' for day,'m' for month or 'y' for year
* @param array Date when service began, in array form: array( 'd' => int, 'm' => int, 'y' => int )
*
* @return int Number of days in the interval
*
* @author Former03 GmbH :: Florian Lippert <*****@*****.**>
*/
public function getDaysForInterval($interval_length, $interval_type, $service_date_begin_array)
{
$returnval = 0;
switch ($interval_type) {
case 'y':
for ($i = 1; $i <= $interval_length; ++$i) {
$returnval += getDaysForYear((int) $service_date_begin_array['m'], (int) $service_date_begin_array['y'] + ($i - 1));
}
break;
case 'm':
for ($i = 1; $i <= $interval_length; ++$i) {
$returnval += getDaysForMonth((int) $service_date_begin_array['m'] + ($i - 1), (int) $service_date_begin_array['y']);
}
break;
case 'd':
default:
$returnval = $interval_length;
break;
}
return $returnval;
}
/**
* Checks if a date array is valid.
*
* @param array The date array
*
* @return bool True if valid, false otherwise.
*
* @author Former03 GmbH :: Florian Lippert <*****@*****.**>
*/
function checkDateArray($date)
{
return is_array($date) && isset($date['y']) && isset($date['m']) && isset($date['d']) && (int) $date['m'] >= 1 && (int) $date['m'] <= 12 && (int) $date['d'] >= 1 && (int) $date['d'] <= getDaysForMonth($date['m'], $date['y']);
}
