PHP Exercises: Compute the sum of the digits of a number
PHP: Exercise-45 with Solution
Write a PHP program to compute the sum of the digits of a number.
Sample Solution: -
PHP Code:
<?php
function sum_of_digits($nums) {
$digits_sum = 0;
for ($i = 0; $i < strlen($nums); $i++) {
$digits_sum += $nums[$i];
}
return $digits_sum;
}
echo sum_of_digits("12345")."\n";
echo sum_of_digits("9999")."\n";
?>
Sample Output:
15 36
Flowchart:
PHP Code Editor:
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Previous: Write a PHP program to print out the sum of pairs of numbers of a given sorted array of positive integers which is equal to a given number.
Next: Write a PHP program to find heights of the top three building in descending order from eight given buildings
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PHP: Tips of the Day
How to Sort Multi-dimensional Array by Value?
Try a usort, If you are still on PHP 5.2 or earlier, you'll have to define a sorting function first:
Example:
function sortByOrder($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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