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PHP Array Exercises : Create a range of specified arrays

PHP Array: Exercise-59 with Solution

Write a PHP program to create a range like the following array.

Array
(
[20] => 2
[21] => 3
[22] => 4
[23] => 5
[24] => 6
[25] => 7
)

Sample Solution:

PHP Code:

<?php
print_r(array_combine(range(20, 25),range(2,7)));
?>

Sample Output: 

Array                                                       
(                                                           
    [20] => 2                                               
    [21] => 3                                               
    [22] => 4                                               
    [23] => 5                                               
    [24] => 6                                               
    [25] => 7                                               
)

Flowchart:

Flowchart: PHP - Create a range of specified arrays

PHP Code Editor:

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Previous: Write a PHP script to combine (using one array for keys and another for its values) the specified two arrays.
Next: PHP For Loop Exercises Home.

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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