PHP Exercises: Check two given arrays of integers of length 1 or more and return true if they have the same first element or they have the same last element
PHP Basic Algorithm: Exercise-88 with Solution
Write a PHP program to check two given arrays of integers of length 1 or more and return true if they have the same first element or they have the same last element.
Sample Solution:
PHP Code :
<?php
function test($a1, $a2)
{
return $a1[0] == $a2[0] || $a1[sizeof($a1) - 1] == $a2[sizeof($a2) - 1];
}
var_dump(test([10, 20, 40, 50], [10, 20, 40, 50]));
var_dump(test([10, 20, 40, 10], [10, 20, 40, 5]));
var_dump(test([12, 24, 35, 55], [1, 20, 40, 5]));
Sample Output:
bool(true) bool(true) bool(false)
Flowchart:
PHP Code Editor:
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Previous: Write a PHP program to check a given array of integers of length 1 or more and return true if the first element and the last element are equal in the given array.
Next: Write a PHP program to compute the sum of the elements of an given array of integers.
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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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