PHP Math Exercises: Find earliest and latest dates from a list of dates
PHP math: Exercise-7 with Solution
Find earliest and latest dates from a list of dates.
Pictorial Presentation:
Sample Solution:
PHP Code:
<?php
$dates = array('2015-02-01', '2015-02-02', '2015-02-03');
echo "Latest Date: ". max($dates)."\n";
echo "Earliest Date: ". min($dates)."\n";
?>
Sample Output:
Latest Date: 2015-02-03 Earliest Date: 2015-02-01
Flowchart :
PHP Code Editor:
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Previous: Write a PHP script to get the information regarding memory usage in KB or MB etc.
Next: Write a PHP function to round a float away from zero to a specified number of decimal places.
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PHP: Tips of the Day
How to Sort Multi-dimensional Array by Value?
Try a usort, If you are still on PHP 5.2 or earlier, you'll have to define a sorting function first:
Example:
function sortByOrder($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
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