PHP Date Exercises : Start and end date of a week (by week number) of a particular year

Last update on May 30 2022 11:43:42 (UTC/GMT +8 hours)

PHP date: Exercise-17 with Solution

Write a PHP function to get start and end date of a week (by week number) of a particular year.

Sample week and year : 12, 2014

Sample Solution:

PHP Code:

<?php
function Start_End_Date_of_a_week($week, $year)
{
    $time = strtotime("1 January $year", time());
	$day = date('w', $time);
	$time += ((7*$week)+1-$day)*24*3600;
	$dates[0] = date('Y-n-j', $time);
	$time += 6*24*3600;
	$dates[1] = date('Y-n-j', $time);
	return $dates;
}

$result = Start_End_Date_of_a_week(12,2014);
echo 'Starting date of the week: '. $result[0]."\n";
echo 'End date the week: '. $result[1];
?>

Sample Output:

Starting date of the week: 2014-3-24                        
End date the week: 2014-3-30

Flowchart :

Flowchart: Start and end date of a week (by week number) of a particular year

PHP Code Editor:

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Previous: Write a PHP script to add/subtract the number of days from a particular date.
Next: Write a PHP script to calculate the current age of a person.

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PHP: Tips of the Day

How to Sort Multi-dimensional Array by Value?

Try a usort, If you are still on PHP 5.2 or earlier, you'll have to define a sorting function first:

Example:

function sortByOrder($a, $b) {
    return $a['order'] - $b['order'];
}

usort($myArray, 'sortByOrder');

Starting in PHP 5.3, you can use an anonymous function:

usort($myArray, function($a, $b) {
    return $a['order'] - $b['order'];
});

And finally with PHP 7 you can use the spaceship operator:

usort($myArray, function($a, $b) {
    return $a['order'] <=> $b['order'];
});

To extend this to multi-dimensional sorting, reference the second/third sorting elements if the first is zero - best explained below. You can also use this for sorting on sub-elements.

usort($myArray, function($a, $b) {
    $retval = $a['order'] <=> $b['order'];
    if ($retval == 0) {
        $retval = $a['suborder'] <=> $b['suborder'];
        if ($retval == 0) {
            $retval = $a['details']['subsuborder'] <=> $b['details']['subsuborder'];
        }
    }
    return $retval;
});

If you need to retain key associations, use uasort() - see comparison of array sorting functions in the manual

Ref : https://bit.ly/3i77vCC