PHP Exercises: Print out the sum of pairs of numbers of a given sorted array of positive integers that is equal to a given number
PHP: Exercise-44 with Solution
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.
Sample Solution: -
PHP Code:
<?php
function find_Pairs($nums, $pair_sum) {
$nums_pairs = "";
for ($i = 0; $i <= count($nums); $i++) {
for ($j = $i + 1; $j < count($nums); $j++) {
if ($nums[$i] + $nums[$j] == (int)$pair_sum) {
$nums_pairs .= $nums[$i] . "," . $nums[$j] . ";";
}
}
}
return $nums_pairs;
}
$nums = array(0,1,2,3,4,5,6);
echo find_Pairs($nums, 7)."\n";
echo find_Pairs($nums, 5)."\n";
?>
Sample Output:
1,6;2,5;3,4; 0,5;1,4;2,3;
Flowchart:
PHP Code Editor:
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Previous: Write a PHP program that multiplies corresponding elements of two given lists.
Next: Write a PHP program to compute the sum of the digits of a number.
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PHP: Tips of the Day
How to Sort Multi-dimensional Array by Value?
Try a usort, If you are still on PHP 5.2 or earlier, you'll have to define a sorting function first:
Example:
function sortByOrder($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
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