PHP Exercises: Compute the sum of the elements of an given array of integers

Last update on May 30 2022 11:41:49 (UTC/GMT +8 hours)

PHP Basic Algorithm: Exercise-89 with Solution

Write a PHP program to compute the sum of the elements of an given array of integers.

Sample Solution:

PHP Code :

<?php
function test($a1)
 { 
       return $a1[0] + $a1[1] + $a1[2] + $a1[3] + $a1[4];
    
 }   

echo test([10, 20, 30, 40, 50]) . "\n";
echo test([10, 20, -30, -40, 50]) . "\n";

Sample Output:

150
10

Flowchart:

PHP Code Editor:

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Previous: Write a PHP program to check two given arrays of integers of length 1 or more and return true if they have the same first element or they have the same last element.
Next: Write a PHP program to rotate the elements of a given array of integers (length 4 ) in left direction and return the new array.

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