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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:

Flowchart: Create new array from a given array of integers shifting all even numbers before all odd numbers.

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