PHP Exercises: Multiplies corresponding elements of two given lists

Last update on May 30 2022 11:42:22 (UTC/GMT +8 hours)

PHP: Exercise-43 with Solution

Write a PHP program that multiplies corresponding elements of two given lists.

Sample Solution: -

PHP Code:

<?php
function multiply_two_lists($x, $y)
  {
    $a = explode(' ',trim($x));
    $b = explode(' ',trim($y));
    foreach($a as $key=>$value){
        $output[$key] = $a[$key]*$b[$key];
    }
    return implode(' ',$output);
}
echo multiply_two_lists(("10 12 3"), ("1 3 3"))."\n";
?>

Sample Output:

10 36 9

Flowchart:

PHP Code Editor:

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Previous: Write a PHP program to find the first non-repeated character in a given string.
Next: 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.

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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