PHP Exercises: Sum of all numerical values embedded in a sentence

Last update on May 30 2022 11:45:48 (UTC/GMT +8 hours)

PHP: Exercise-69 with Solution

Write a PHP program to sum of all numerical values (positive integers) embedded in a sentence.
Sentences with positive integers are given over multiple lines. Each line is a character string containing one-byte alphanumeric characters, symbols, spaces, or an empty line. However the input is 80 characters or less per line and the sum is 10,000 or less.

Sample Solution: -

PHP Code:

<?php
$sum = 0;
    $s = rtrim(fgets(STDIN));
    if (preg_match_all('/[0-9]+/', $s, $a)) {
        foreach ($a[0] as $v) {
            $sum += (int) $v;
        }
    }
echo "Sum of the numeric values: ".$sum . PHP_EOL;
?>

Sample Input:
5 apple and 10 orange are rotten in the basket

Sample Output:

Sum of the numeric values: 15

Flowchart:

PHP Code Editor:

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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