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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:

Flowchart: PHP - Sort subnets

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

PHP: Anonymous recursive PHP functions

In order for it to work, you need to pass $factorial as a reference

$factorial = function( $n ) use ( &$factorial ) {
    if( $n == 1 ) return 1;
    return $factorial( $n - 1 ) * $n;
};
print $factorial( 5 );

Ref : https://bit.ly/38dj7jm