PHP Array Exercises : Function to sort subnets
PHP Array: Exercise-21 with Solution
Write a PHP function to sort subnets.
Sample Solution:
PHP Code:
<?php
function sort_subnets ($x, $y) {
$x_arr = explode('.', $x);
$y_arr = explode('.', $y);
foreach (range(0,3) as $i) {
if ( $x_arr[$i] < $y_arr[$i] ) {
return -1;
}
elseif ( $x_arr[$i] > $y_arr[$i] ) {
return 1;
}
}
return -1;
}
$subnet_list =
array('192.169.12',
'192.167.11',
'192.169.14',
'192.168.13',
'192.167.12',
'122.169.15',
'192.167.16'
);
usort($subnet_list, 'sort_subnets');
print_r($subnet_list);
?>
Sample Output:
Array ( [0] => 122.169.15 [1] => 192.167.11 [2] => 192.167.12 [3] => 192.167.16 [4] => 192.168.13 [5] => 192.169.12 [6] => 192.169.14 )
Flowchart:
PHP Code Editor:
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Previous: Write a PHP function to sort an array according to another array acting as a priority list.
Next: Write a PHP script to sort the following array by the day (page_id) and username.
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PHP: Tips of the Day
How to Sort Multi-dimensional Array by Value?
Try a usort, If you are still on PHP 5.2 or earlier, you'll have to define a sorting function first:
Example:
function sortByOrder($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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