PHP Exercises: Create new array from a given array of integers shifting all even numbers before all odd numbers
PHP Basic Algorithm: Exercise-129 with Solution
Write a PHP program to create new array from a given array of integers shifting all even numbers before all odd numbers.
Sample Solution:
PHP Code :
<?php
function test($numbers)
{
$index = 0;
for ($i = 0; $i < sizeof($numbers); $i++)
{
if ($numbers[$i] % 2 == 0)
{
$temp = $numbers[$index];
$numbers[$index] = $numbers[$i];
$numbers[$i] = $temp;
$index++;
}
}
return $numbers;
}
$result = test([1, 2, 5, 3, 5, 4, 6, 9, 11] );
echo "New array: " . implode(',', $result);
Sample Output:
New array: 2,4,6,3,5,1,5,9,11
Flowchart:
PHP Code Editor:
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Previous: Write a PHP program to create a new array after replacing all the values 5 with 0 shifting all zeros to right direction.
Next: Write a PHP program to check if the value of each element is equal or greater than the value of previous element of a given array of integers.
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PHP: Tips of the Day
How to Sort Multi-dimensional Array by Value?
Try a usort, If you are still on PHP 5.2 or earlier, you'll have to define a sorting function first:
Example:
function sortByOrder($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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