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PHP Exercises: Check if a given positive number is a multiple of 3 or a multiple of 7

PHP Basic Algorithm: Exercise-10 with Solution

Write a PHP program to check if a given positive number is a multiple of 3 or a multiple of 7.

Sample Solution:

PHP Code :

<?php
function test($n) 
{
   return $n % 3 == 0 || $n % 7 == 0;
}

var_dump(test(3));
var_dump(test(14));
var_dump(test(12));
var_dump(test(37));

Sample Output:

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

Pictorial Presentation:

PHP Basic Algorithm Exercises: Check if a given positive number is a multiple of 3 or a multiple of 7.

Flowchart:

Flowchart: Check if a given positive number is a multiple of 3 or a multiple of 7.

PHP Code Editor:

Contribute your code and comments through Disqus.

Previous: Write a PHP program to create a new string with the last char added at the front and back of a given string of length 1 or more.
Next: Write a PHP program to create a new string taking the first 3 characters of a given string and return the string with the 3 characters added at both the front and back. If the given string length is less than 3, use whatever characters are there.

What is the difficulty level of this exercise?

Test your Programming skills with w3resource's quiz.



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