PHP for loop Exercises : Add all between two integers and display the sum

Last update on May 30 2022 11:45:36 (UTC/GMT +8 hours)

PHP for loop: Exercise-2 with Solution

Create a script using a for loop to add all the integers between 0 and 30 and display the sum.

Pictorial Presentation:

PHP for loop Exercises: Add all between two integers and display the sum

Sample Solution:

PHP Code:

<?php
$sum = 0;
for($x=1; $x<=30; $x++)
{
$sum +=$x;
}
echo "The sum of the numbers 0 to 30 is $sum"."\n";
?>

Sample Output:

The sum of the numbers 0 to 30 is 465

Flowchart :

PHP Code Editor:

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Previous: Create a script that displays 1-2-3-4-5-6-7-8-9-10 on one line. There will be no hyphen(-) at starting and ending position.
Next: Create a script to construct the specific pattern, using nested for loop.

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