Q:

Write a PHP program to sort a list of elements using Shell sort

hamza
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2022-05-18
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Write a PHP program to sort a list of elements using Shell sort.

According to Wikipedia "Shell sort or Shell's method, is an in-place comparison sort. It can be seen as either a generalization of sorting by exchange (bubble sort) or sorting by insertion (insertion sort). The method starts by sorting pairs of elements far apart from each other, then progressively reducing the gap between elements to be compared. Starting with far apart elements can move some out-of-place elements into position faster than a simple nearest neighbor exchange."

An example run of Shellsort with gaps 5, 3 and 1 is shown below.

Php programming,
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hamza
2022-05-18
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<?php
function shell_Sort($my_array)
{
	$x = round(count($my_array)/2);
	while($x > 0)
	{
		for($i = $x; $i < count($my_array);$i++){
			$temp = $my_array[$i];
			$j = $i;
			while($j >= $x && $my_array[$j-$x] > $temp)
			{
				$my_array[$j] = $my_array[$j - $x];
				$j -= $x;
			}
			$my_array[$j] = $temp;
		}
		$x = round($x/2.2);
	}
	return $my_array;
}
 
$test_array = array(3, 0, 2, 5, -1, 4, 1);
echo "Original Array :\n";
echo implode(', ',$test_array );
echo "\nSorted Array\n:";
echo implode(', ',shell_Sort($test_array)). PHP_EOL;
?>

Sample Output:

Original Array :                                                    
3, 0, 2, 5, -1, 4, 1                                                
Sorted Array :                                                      
-1, 0, 1, 2, 3, 4, 5

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