PHP Exercises: Check if a given number is within 2 of a multiple of 10

Last update on May 30 2022 11:40:45 (UTC/GMT +8 hours)

PHP Basic Algorithm: Exercise-43 with Solution

Write a PHP program to check if a given number is within 2 of a multiple of 10.

Sample Solution:

PHP Code :

<?php
function test($n)
{
   return $n % 10 <= 2 || $n % 10 >= 8;
 }

var_dump(test(3));
var_dump(test(7));
var_dump(test(8));
var_dump(test(21));

Sample Output:

bool(false)
bool(false)
bool(true)
bool(true)

Flowchart:

PHP Code Editor:

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Previous: Write a PHP program to check if a given non-negative given number is a multiple of 3 or 7, but not both.
Next: Write a PHP program to compute the sum of the two given integers. If one of the given integer value is in the range 10..20 inclusive return 18.

What is the difficulty level of this exercise?

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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