Related
The following code works if I manually type in every day for every single month in each hard coded array.
I then loop through the arrays for a match and if I find it, I return the first index and the last index value of that array. These are the pay period start and end dates later to be used with mysql select queries.
// MOUNTAIN DAYLIGHT SAVINGS TIME
date_default_timezone_set('MST7MDT');
// = PHP Default TimeZone
//print 'MOUNTAIN DAYLIGHT SAVINGS TIME';
//print '<p>';
// = MySQL CURRDATE() in MySQL DATETIME Format.
$php_current_date = date('Y-m-d');
// 2019 Pay Periods - MONTHLY
$parent_array = array(
1 => array('2019-01-01','2019-01-31'),
2 => array('2019-02-01','2019-02-28'),
3 => array('2019-03-01','2019-03-31'),
4 => array('2019-04-01','2019-04-30'),
5 => array('2019-05-01','2019-05-31'),
6 => array('2019-06-01','2019-06-30'),
7 => array('2019-07-01','2019-07-31'),
8 => array('2019-08-01','2019-08-31'),
9 => array('2019-09-01','2019-09-30'),
10 => array('2019-10-01','2019-10-31'),
11 => array('2019-11-01','2019-11-30'),
12 => array('2019-12-01','2019-12-31'),
13 => array('2020-01-01','2020-01-31'),
14 => array('2020-02-01','2020-02-29'),
15 => array('2020-03-01','2020-03-31'),
16 => array('2020-04-01','2020-04-30'),
17 => array('2020-05-01','2020-05-31'),
18 => array('2020-06-01','2020-06-30'),
19 => array('2020-07-01','2020-07-31'),
20 => array('2020-08-01','2020-08-31'),
21 => array('2020-09-01','2020-09-30'),
22 => array('2020-10-01','2020-10-31'),
23 => array('2020-11-01','2020-11-30'),
24 => array('2020-12-01','2020-12-31')
);
$current_pay_period_start = '';
$current_pay_period_end = '';
// For each child Array of date Strings inside parent Array of arrays...
foreach($parent_array as $child_array){
// Speculate the variable name as $result_found while searching each child Array of date Strings
// for the Current date in *Mountain Daylight Savings Time
$result_found = in_array($php_current_date, $child_array);
// if we have a match...
if ($result_found) {
// GET LEFT-MOST index and assign it to a variable.
$current_pay_period_start = current($child_array);
// GET RIGHT-MOST index and assign it to another variable.
$current_pay_period_end = end($child_array);
// Add a day for mysql query logic...
// because mysql uses < instead of =< for comparison in the query the follows...
$current_pay_period_end = date('Y-m-d', strtotime($current_pay_period_end . ' + 1 days'));
/*
Following Works ONLY on direct access.
Debug Only.
Eg. localhost/folder/filename.php
*/
print 'Php Current Date: ' . $php_current_date;
print '<br>';
print 'Current Pay Period Start: ' . $current_pay_period_start;
print '<br>';
print 'Current Pay Period End: ' . $current_pay_period_end;
exit;
}
}
I have tried to implement the solution below but, I keep getting errors related to me not being able to compare date strings... It seems I have learned to find date strings in an array of arrays but they aren't really dates as far as php is concerned.
/**
* #param DateTime $date Date that is to be checked if it falls between $startDate and $endDate
* #param DateTime $startDate Date should be after this date to return true
* #param DateTime $endDate Date should be before this date to return true
* return bool
*/
function isDateBetweenDates(DateTime $date, DateTime $startDate, DateTime $endDate) {
return $date > $startDate && $date < $endDate;
}
$fromUser = new DateTime("2012-03-01");
$startDate = new DateTime("2012-02-01 00:00:00");
$endDate = new DateTime("2012-04-30 23:59:59");
echo isDateBetweenDates($fromUser, $startDate, $endDate);
Here's how I try to call it and get the error...
isDateBetweenDates($php_current_date, $current_pay_period_start, $current_pay_period_end);
I have wrote the following for you, that compares the two dates from your array. Hopefully it will help!
$php_current_date = date('Y-m-d');
$parent_array = array(
1 => array('2019-01-01','2019-01-31'),
2 => array('2019-02-01','2019-02-28'),
3 => array('2019-03-01','2019-03-31'),
4 => array('2019-04-01','2019-04-30'),
5 => array('2019-05-01','2019-05-31'),
6 => array('2019-06-01','2019-06-30'),
7 => array('2019-07-01','2019-07-31'),
8 => array('2019-08-01','2019-08-31'),
9 => array('2019-09-01','2019-09-30'),
10 => array('2019-10-01','2019-10-31'),
11 => array('2019-11-01','2019-11-30'),
12 => array('2019-12-01','2019-12-31'),
13 => array('2020-01-01','2020-01-31'),
14 => array('2020-02-01','2020-02-29'),
15 => array('2020-03-01','2020-03-31'),
16 => array('2020-04-01','2020-04-30'),
17 => array('2020-05-01','2020-05-31'),
18 => array('2020-06-01','2020-06-30'),
19 => array('2020-07-01','2020-07-31'),
20 => array('2020-08-01','2020-08-31'),
21 => array('2020-09-01','2020-09-30'),
22 => array('2020-10-01','2020-10-31'),
23 => array('2020-11-01','2020-11-30'),
24 => array('2020-12-01','2020-12-31')
);
foreach ($parent_array as $child_array) {
//compare dates using strtotime, did the conversion in the if statement to retain the original date format, for output if results are found.
if (strtotime($php_current_date) >= strtotime($child_array[0]) && strtotime($php_current_date) <= strtotime($child_array[1])) {
// match found...
$current_pay_period_start = $child_array[0];
$current_pay_period_end = $child_array[1];
print 'Php Current Date: ' . $php_current_date;
print '<br>';
print 'Current Pay Period Start: ' . $current_pay_period_start;
print '<br>';
print 'Current Pay Period End: ' . $current_pay_period_end;
exit;
}
}
I have tested it and the following is outputted:
Php Current Date: 2019-03-07
Current Pay Period Start: 2019-03-01
Current Pay Period End: 2019-03-31
Hopefully this will help!
I'm having a hell of a time trying to solve the following problem:
It's a calendar program where given a set of available datetime sets from multiple people, I need to figure out what datetime ranges everyone is available in PHP
Availability Sets:
p1: start: "2016-04-30 12:00", end: "2016-05-01 03:00"
p2: start: "2016-04-30 03:00", end: "2016-05-01 03:00"
p3: start: "2016-04-30 03:00", end: "2016-04-30 13:31"
start: "2016-04-30 15:26", end: "2016-05-01 03:00"
I'm looking for a function that I can call that will tell me what datetime ranges all (p) people are available at the same time.
In the above example the answer should be:
2016-04-30 12:00 -> 2016-04-30 13:31
2016-04-30 15:26 -> 2016-05-01 03:00
I did find this similar question and answer
Datetime -Determine whether multiple(n) datetime ranges overlap each other in R
But I have no idea what language that is, and have to unable to translate the logic in the answer.
Well that was fun. There's probably a more elegant way of doing this than looping over every minute, but I don't know if PHP is the language for it. Note that this currently needs to manage the start and end times to search separately, although it would be fairly trivial to calculate them based on the available shifts.
<?php
$availability = [
'Alex' => [
[
'start' => new DateTime('2016-04-30 12:00'),
'end' => new DateTime('2016-05-01 03:00'),
],
],
'Ben' => [
[
'start' => new DateTime('2016-04-30 03:00'),
'end' => new DateTime('2016-05-01 03:00'),
],
],
'Chris' => [
[
'start' => new DateTime('2016-04-30 03:00'),
'end' => new DateTime('2016-04-30 13:31')
],
[
'start' => new DateTime('2016-04-30 15:26'),
'end' => new DateTime('2016-05-01 03:00')
],
],
];
$start = new DateTime('2016-04-30 00:00');
$end = new DateTime('2016-05-01 23:59');
$tick = DateInterval::createFromDateString('1 minute');
$period = new DatePeriod($start, $tick, $end);
$overlaps = [];
$overlapStart = $overlapUntil = null;
foreach ($period as $minute)
{
$peopleAvailable = 0;
// Find out how many people are available for the current minute
foreach ($availability as $name => $shifts)
{
foreach ($shifts as $shift)
{
if ($shift['start'] <= $minute && $shift['end'] >= $minute)
{
// If any shift matches, this person is available
$peopleAvailable++;
break;
}
}
}
// If everyone is available...
if ($peopleAvailable == count($availability))
{
// ... either start a new period...
if (!$overlapStart)
{
$overlapStart = $minute;
}
// ... or track an existing one
else
{
$overlapUntil = $minute;
}
}
// If not and we were previously in a period of overlap, end it
elseif ($overlapStart)
{
$overlaps[] = [
'start' => $overlapStart,
'end' => $overlapUntil,
];
$overlapStart = null;
}
}
foreach ($overlaps as $overlap)
{
echo $overlap['start']->format('Y-m-d H:i:s'), ' -> ', $overlap['end']->format('Y-m-d H:i:s'), PHP_EOL;
}
There are some bugs with this implementation, see the comments. I'm unable to delete it as it's the accepted answer. Please use iainn or fusion3k's very good answers until I get around to fixing it.
There's actually no need to use any date/time handling to solve this
problem. You can exploit the fact that dates in this format are in alphabetical as well as chronological order.
I'm not sure this makes the solution any less complex. It's probably less
readable this way. But it's considerably faster than iterating over every minute so you might choose it if performance is a concern.
You also get to use
every
single
array
function
out there, which is nice.
Of course, because I haven't used any date/time functions, it might not work if Daylight Savings Time or users in different time zones need dealing with.
$availability = [
[
["2016-04-30 12:00", "2016-05-01 03:00"]
],
[
["2016-04-30 03:00", "2016-05-01 03:00"]
],
[
["2016-04-30 03:00", "2016-04-30 13:31"],
["2016-04-30 15:26", "2016-05-01 03:00"]
]
];
// Placeholder array to contain the periods when everyone is available.
$periods = [];
// Loop until one of the people has no periods left.
while (count($availability) &&
count(array_filter($availability)) == count($availability)) {
// Select every person's earliest date, then choose the latest of these
// dates.
$start = array_reduce($availability, function($carry, $ranges) {
$start = array_reduce($ranges, function($carry, $range) {
// This person's earliest start date.
return !$carry ? $range[0] : min($range[0], $carry);
});
// The latest of all the start dates.
return !$carry ? $start : max($start, $carry);
});
// Select each person's range which contains this date.
$matching_ranges = array_filter(array_map(function($ranges) use($start) {
return current(array_filter($ranges, function($range) use($start) {
// The range starts before and ends after the start date.
return $range[0] <= $start && $range[1] >= $start;
}));
}, $availability));
// Find the earliest of the ranges' end dates, and this completes our
// first period that everyone can attend.
$end = array_reduce($matching_ranges, function($carry, $range) {
return !$carry ? $range[1] : min($range[1], $carry);
});
// Add it to our list of periods.
$periods[] = [$start, $end];
// Remove any availability periods which finish before the end of this
// new period.
array_walk($availability, function(&$ranges) use ($end) {
$ranges = array_filter($ranges, function($range) use($end) {
return $range[1] > $end;
});
});
}
// Output the answer in the specified format.
foreach ($periods as $period) {
echo "$period[0] -> $period[1]\n";
}
/**
* Output:
*
* 2016-04-30 12:00 -> 2016-04-30 13:31
* 2016-04-30 15:26 -> 2016-05-01 03:00
*/
A different approach to your question is to use bitwise operators. The benefits of this solution are memory usage, speed and short code. The handicap is that — in your case — we can not use php integer, because we work with large numbers (1 day in minutes is 224*60), so we have to use GMP Extension, that is not available by default in most php distribution. However, if you use apt-get or any other packages manager, the installation is very simple.
To better understand my approach, I will use an array with a total period of 30 minutes to simplify binary representation:
$calendar =
[
'p1' => [
['start' => '2016-04-30 12:00', 'end' => '2016-04-30 12:28']
],
'p2' => [
['start' => '2016-04-30 12:10', 'end' => '2016-04-30 12:16'],
['start' => '2016-04-30 12:22', 'end' => '2016-05-01 12:30']
]
];
First of all, we find min and max dates of all array elements, then we init the free (time) variable with the difference in minutes between max and min. In above example (30 minutes), we obtain 230-20=1,073,741,823, that is a binary with 30 ‘1’ (or with 30 bits set):
111111111111111111111111111111
Now, for each person, we create the corresponding free-time variable with the same method. For the first person is easy (we have only one time interval): the difference between start and min is 0, the difference between end and min is 28, so we have 228-20=268435455, that is:
001111111111111111111111111111
At this point, we update global free time with a AND bitwise operation between global free time itself and person free time. The OR operator set bits if they are set in both compared values:
111111111111111111111111111111 global free time
001111111111111111111111111111 person free time
==============================
001111111111111111111111111111 new global free time
For the second person, we have two time intervals: we calculate each time interval with know method, then we compone global person free time using OR operator, that set bits if they are set in either first or second value:
000000000000001111110000000000 12:10 - 12:16
111111110000000000000000000000 12:22 - 12:30
==============================
111111110000001111110000000000 person total free time
Now we update global free time with the same method used for first person (AND operator):
001111111111111111111111111111 previous global free time
111111110000001111110000000000 person total free time
==============================
001111110000001111110000000000 new global free time
└────┘ └────┘
:28-:22 :16-:10
As you can see, at the end we have an integer with bits set only in minutes when everyone is available (you have to count starting from right). Now, you can convert back this integer to datetimes. Fortunately, GMP extension has a method to find 1/0 offset, so we can avoid to perform a for/foreach loop through all digits (that in real case are many more than 30).
Let's see the complete code to apply this concept to your array:
$calendar =
[
'p1' => [
['start' => '2016-04-30 12:00', 'end' => '2016-05-01 03:00']
],
'p2' => [
['start' => '2016-04-30 03:00', 'end' => '2016-05-01 03:00']
],
'p3' => [
['start' => '2016-04-30 03:00', 'end' => '2016-04-30 13:31'],
['start' => '2016-04-30 15:26', 'end' => '2016-05-01 03:00']
]
];
/* Get active TimeZone, then calculate min and max dates in minutes: */
$tz = new DateTimeZone( date_default_timezone_get() );
$flat = call_user_func_array( 'array_merge', $calendar );
$min = date_create( min( array_column( $flat, 'start' ) ) )->getTimestamp()/60;
$max = date_create( max( array_column( $flat, 'end' ) ) )->getTimestamp()/60;
/* Init global free time (initially all-free): */
$free = gmp_sub( gmp_pow( 2, $max-$min ), gmp_pow( 2, 0 ) );
/* Process free time(s) for each person: */
foreach( $calendar as $p )
{
$pf = gmp_init( 0 );
foreach( $p as $time )
{
$start = date_create( $time['start'] )->getTimestamp()/60;
$end = date_create( $time['end'] )->getTimestamp()/60;
$pf = gmp_or( $pf, gmp_sub( gmp_pow( 2, $end-$min ), gmp_pow( 2, $start-$min ) ) );
}
$free = gmp_and( $free, $pf );
}
$result = [];
$start = $end = 0;
/* Create resulting array: */
while( ($start = gmp_scan1( $free, $end )) >= 0 )
{
$end = gmp_scan0( $free, $start );
if( $end === False) $end = strlen( gmp_strval( $free, 2 ) )-1;
$result[] =
[
'start' => date_create( '#'.($start+$min)*60 )->setTimezone( $tz )->format( 'Y-m-d H:i:s' ),
'end' => date_create( '#'.($end+$min)*60 )->setTimezone( $tz )->format( 'Y-m-d H:i:s' )
];
}
print_r( $result );
Output:
Array
(
[0] => Array
(
[start] => 2016-04-30 12:00:00
[end] => 2016-04-30 13:31:00
)
[1] => Array
(
[start] => 2016-04-30 15:26:00
[end] => 2016-05-01 03:00:00
)
)
3v4l.org demo
Some additional notes:
At the start, we set $tz to current timezone: we will use it later, at the end, when we create final dates from timestamps. Dates created from timestamps are in UTC, so we have to set correct timezone.
To retrieve initial $min and $max values in minutes, firstly we flat original array, then we retrieve min and max date using array_column.
gmp_sub subtract second argument from first argument, gmp_pow raise number (arg 1) into power (arg 2).
In the final while loop, we use gmp_scan1 and gmp_scan0 to retrieve each ‘111....’ interval, then we create returning array elements using gmp_scan1 position for start key and gmp_scan0 position for end key.
I posted a question last night that turned out to not be the problem. Digging around, I have discovered that the below code is giving me a headche. I had this working, but now for some reason I get no output. When I var_dump the function that gives me the $finishmins value, it outputs everything correctly until the point where it has to search the array (as below). After this it shows NULL. I was originally using strpos to find out if it started with a zero, then stripped said zero to match to the array, but when it stopped working, I tried the below approach to reduce code.
The point of the code is to convert minutes in time to minutes in decimal notation. I.e. 1 minute = 02, thus 12:01 = 12.02.
$finishmins = '01';
$finishmins = $minarray[$finishmins];
$minarray = array(
00 => '00',
01 => '02',
02 => '03',
03 => '05',
04 => '07',
05 => '08',
06 => '10',
07 => '12',
08 => '13',
09 => '15',
10 => '17',
'18',
// Array continues to 59 => '98'
);
echo $finishmins;
I have pasted the complete code here: http://codepad.org/EUW3n7AB and still can't seem to find the problem.
There are two issues here:
Array indices behave differently between strings and numbers,
Variable scope of $minarray.
$arr[01] and $arr['01'] are not the same thing, so you should be more explicit; in your case you can just leave the array numerically indexed, i.e.:
$minarray = array('00', '02', '03', '05', ...);
Then, you use an (int) cast on the given minutes:
$finishmins = $minarray[(int)$finishmins];
You can solve the second issue by passing the array as a function argument:
function finishtime($minarray, $finish)
Then calling it like so:
echo finishtime($minarray, '12:01');
You have to use the keyword global in your function when referring to the $minarray variable:
function finishtime($finish) {
global $minarray;
$finishx = explode(':', $finish);
$finishhours = $finishx[0];
$finishmins = $finishx[1];
$finishmins;
var_dump($finishmins);
$finishmins = $minarray[$finishmins];
var_dump($finishmins);
$finishtime = $finishhours . '.' . $finishmins;
return $finishtime;
}
I am building a small class combination to calculate the precise date of the beginning of a semester. The rules for determining the beginning of the semester goes as follow :
The monday of week number ## and after dd-mm-yyyy date
ie: for winter its week number 2 and it must be after the january 8th of that year
I am building a resource class that contain these data for all the semesters (4 in total). But now I am facing an issue based on the public holidays. Since some of those might be on a Monday, in those cases I need to get the date of the Tuesday.
The issue I am currently working on is the following :
The target semester begins on or after august 30 and must be on week 35.
I also have to take account of a public holiday which happen on the first monday of september.
The condition in PHP terms is the following
if (date('m', myDate) == 9 // if the month is september
&& date('w', myDate) == 1 // if the day of the week is monday
&& date('d', myDate) < 7 // if we are in the first 7 days of september
)
What would be the best way to "word" this as a condition and store it in an array?
EDIT
I might not have been clear enough, finding the date is not the problem here. The actual problem is storing a condition in a configuration array that looks like the following :
$_ressources = array(
1 => array(
'dateMin' => '08-01-%',
'weekNumber' => 2,
'name' => 'Winter',
'conditions' => array()
),
2 => array(
'dateMin' => '30-04-%',
'weekNumber' => 18,
'name' => 'Spring',
'conditions' => array()
),
3 => array(
'dateMin' => '02-07-%',
'weekNumber' => 27,
'name' => 'Summer',
'conditions' => array()
),
4 => array(
'dateMin' => '30-08-%',
'weekNumber' => 35,
'name' => 'Autumn',
'conditions' => array("date('m', %date%) == 9 && date('w', %date%) == 1 && date('d', %date%) < 7")
)
);
The issue I have with the way it's presented now, is that I will have to use the eval() function, which I would rather not to.
You said:
The target semester begins on or after august 30 and must be on week 35.
If that's the case you can simple check for week number.
if(date('W', myDate) == 35)
Or if your testing condition is correct then you should compare day number till 7 as it starts from 1.
if((date('m', myDate) == 9 // september
&& date('w', myDate) == 1 // monday
&& date('d', myDate) <= 7 // first 7 days of september
)
And then in the if statement, once you have found the monday which would be OK IF its not a public holiday, do this
if(...){
while(!array_search (myDate, aray_of_public_holidays))
date_add($myDate, date_interval_create_from_date_string('1 days'));
}
Here the array_of_public_holidays contains the list of public holidays.
Update with Code
Following code should work for your purposes
<?php
// array with public holidays
$public_holidays = array(/* public holidays */);
// start on 30th august
$myDate = new DateTime('August 30');
// loop till week number does not cross 35
while($myDate->format('W') <= 35){
// if its a monday
if($myDate->format('w') == 1){
// find the next date not a public holiday
while(array_search($myDate, $public_holidays))
$myDate->add(date_interval_create_from_date_string('1 days'));
// now myDate stores the valid semester start date so exit loop
break;
}
// next date
$myDate->add(date_interval_create_from_date_string('1 days'));
}
// now myDate is the semester start date
?>
Update according to updated question
Following code should work for your needs. You do not need to store the condition in your array as PHP code. The following code shows how it can be done
// semester conditions
$sem_conditions = array(
1 => array(
'dateMin' => '08-01-%',
'weekNumber' => 2,
'name' => 'Winter'
),
2 => array(
'dateMin' => '30-04-%',
'weekNumber' => 18,
'name' => 'Spring'
),
3 => array(
'dateMin' => '02-07-%',
'weekNumber' => 27,
'name' => 'Summer'
),
4 => array(
'dateMin' => '30-08-%',
'weekNumber' => 35,
'name' => 'Autumn'
)
);
// array with public holidays format (d-M)
$public_holidays = array('05-09', '10-01');
// store sem starts
$sem_starts = array();
// for each semester
foreach($sem_conditions as $sem){
// start date
$myDate = date_create_from_format('d-m', substr($sem['dateMin'], 0, -2));
// loop till week number does not cross $sem['weekNumber']
while($myDate->format('W') <= $sem['weekNumber']){
// if its a monday
if($myDate->format('w') == 1){
// find the next date not a public holiday
while(array_search($myDate->format('d-m'), $public_holidays) !== false)
$myDate->add(date_interval_create_from_date_string('1 days'));
// now myDate stores the valid semester start date so exit loop
break;
}
// next date
$myDate->add(date_interval_create_from_date_string('1 days'));
}
// add to sem starts
$sem_start[$sem['name']] = $myDate->format('d-m-Y');
}
var_dump($sem_start);
The target semester begins on or after august 30 and must be on week 35
The start of the semester is the minimal date between week 35 and August 30:
$week35 = new DateTime("January 1 + 35 weeks");
$august30 = new DateTime("August 30");
$start = min($week35, $august30);
Alternatively:
$start = min(date_create("January 1 + 52 weeks"), date_create("August 30"));
I have a holiday class that contains a multidimensional array of holidays with different time periods that works basically like this:
$this->bgArray = array( 'background' => array(
array( 'name' => 'SuperBowl',
'start' => '06 Feb 2011',
'end' => '07 Feb 2011'),
array( 'name' => 'presidentsday2011',
'start' => '21 Feb 2011',
'end' => '22 Feb 2011'),
array( 'name' => 'marchmadness6',
'start' => '01 Mar 2011',
'end' => '02 Mar 2011')));
and when it is called I want to be able to select the right holiday and run subsequent code, currently I have that set up as:
foreach($holidays->bgArray['background'] AS $holiday)
{
if (($holidays->today >= strtotime($holiday['start']) && $holidays->today < strtotime($holiday['end']) || (isset($_REQUEST[$holiday['name']])) ))
{
$background = $holiday['name'];
}
}
$this->set_background($background);
this code is all working great but personally I feel like there is a better way to do this code than a foreach loop. Does anyone have any suggestions? Also, no I don't have access to a DB so I have to this all within PHP. Any help is appreciated, thanks guy.
foreach is fine for arrays. You might want to use unix timestamps directly in your array since always using strtotime isn't excactly the fastest way.
What you also could do is splitting the array up into months, having a subarray for each month. That way you don't have to iterate over all holidays but only the specific ones for the month to be displayed.