PHP Exercises: Create a new array length 3 from a given array using the elements from the middle of the array
PHP Basic Algorithm: Exercise-103 with Solution
Write a PHP program to create a new array length 3 from a given array (length atleast 3) using the elements from the middle of the array.
Sample Solution:
PHP Code :
<?php
function test($numbers)
{
return [$numbers[sizeof($numbers) / 2 - 1], $numbers[sizeof($numbers) / 2], $numbers[sizeof($numbers) / 2 + 1]];
}
$result = test([1, 5, 7, 9, 11, 13] );
echo "New array: " . implode(',', $result);
Sample Output:
New array: 7,9,11
Flowchart:
PHP Code Editor:
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Previous: Write a PHP program to create a new array from two give array of integers, each length 3.
Next: Write a PHP program to find the largest value from first, last, and middle elements of a given array of integers of odd length (atleast 1).
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PHP: Tips of the Day
How to Sort Multi-dimensional Array by Value?
Try a usort, If you are still on PHP 5.2 or earlier, you'll have to define a sorting function first:
Example:
function sortByOrder($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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