PHP Exercises: Shift an element in left direction and return a new array
PHP Basic Algorithm: Exercise-124 with Solution
Write a PHP program to shift an element in left direction and return a new array.
Sample Solution:
PHP Code :
<?php
function test($numbers)
{
$size = sizeof($numbers);
$shiftNums = [$size];
for ($i = 0; $i < $size; $i++)
{
$shiftNums[$i] = $numbers[($i + 1) % $size];
}
return $shiftNums;
}
$result = test([10, 20, -30, -40, 50] );
echo "New array: " . implode(',', $result);
Sample Output:
New array: 20,-30,-40,50,10
Flowchart:
PHP Code Editor:
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Previous: Write a PHP program to check a given array of integers and return true if the array contains three increasing adjacent numbers.
Next: Write a PHP program to create a new array taking the elements before the element value 5 from a given array of integers.
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PHP: Tips of the Day
How to Sort Multi-dimensional Array by Value?
Try a usort, If you are still on PHP 5.2 or earlier, you'll have to define a sorting function first:
Example:
function sortByOrder($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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