PHP Searching and Sorting Algorithm: Quick sort

PHP Searching and Sorting Algorithm: Exercise-1 with Solution

Write a PHP program to sort a list of elements using Quick sort.

Quick sort is a comparison sort, meaning that it can sort items of any type for which a "less-than" relation (formally, a total order) is defined.

Pictorial presentation - Quick Sort algorithm :

PHP Quick sort pictorial presentation
c # Quick sort part-2

Animated visualization of the quicksort algorithm. The horizontal lines are pivot values.

Animation: Quicksort algorithm

Animation credits : RolandH

Sample Solution:

PHP Code:

function quick_sort($my_array)
	$loe = $gt = array();
	if(count($my_array) < 2)
		return $my_array;
	$pivot_key = key($my_array);
	$pivot = array_shift($my_array);
	foreach($my_array as $val)
		if($val <= $pivot)
			$loe[] = $val;
		}elseif ($val > $pivot)
			$gt[] = $val;
	return array_merge(quick_sort($loe),array($pivot_key=>$pivot),quick_sort($gt));
$my_array = array(3, 0, 2, 5, -1, 4, 1);
echo 'Original Array : '.implode(',',$my_array).'\n';
$my_array = quick_sort($my_array);
echo 'Sorted Array : '.implode(',',$my_array);

Sample Output:

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

Flowchart :

Flowchart: PHP - program of Heap sort

PHP Code Editor:

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