PHP Exercises: Check a given array of integers and return true if the array contains 10 or 20 twice
PHP Basic Algorithm: Exercise-97 with Solution
Write a PHP program to check a given array of integers and return true if the array contains 10 or 20 twice. The length of the array will be 0, 1, or 2.
Sample Solution:
PHP Code :
<?php
function test($nums)
{
return sizeof($nums) == 2 && (($nums[0] == 10 && $nums[1] == 10) || ($nums[0] == 20 && $nums[1] == 20));
}
var_dump(test([12, 20]));
var_dump(test([20, 20]));
var_dump(test([10, 10]));
var_dump(test([10]));
Sample Output:
bool(false) bool(true) bool(true) bool(false)
Flowchart:
PHP Code Editor:
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Previous: Write a PHP program to check if a given array of integers and length 2, does not contain 15 or 20.
Next: Write a PHP program to check a given array of integers, length 3 and create a new array. If there is a 5 in the given array immediately followed by a 7 then set 7 to 1.
What is the difficulty level of this exercise?
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PHP: Tips of the Day
How to Sort Multi-dimensional Array by Value?
Try a usort, If you are still on PHP 5.2 or earlier, you'll have to define a sorting function first:
Example:
function sortByOrder($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
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