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php Programming Exercies

PHP Searching and Sorting Algorithm: Selection sort

PHP Searching and Sorting Algorithm: Exercise-4 with Solution

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

The selection sort improves on the bubble sort by making only one exchange for every pass through the list.

Pictorial Presentation : Selection Sort

PHP sharp selection short

Sample Solution :

PHP Code :

<?php

function selection_sort($data)
{
for($i=0; $i<count($data)-1; $i++) {
	$min = $i;
	for($j=$i+1; $j<count($data); $j++) {
		if ($data[$j]<$data[$min]) {
			$min = $j;
		}
	}
    $data = swap_positions($data, $i, $min);
}
return $data;
}

function swap_positions($data1, $left, $right) {
	$backup_old_data_right_value = $data1[$right];
	$data1[$right] = $data1[$left];
	$data1[$left] = $backup_old_data_right_value;
	return $data1;
}
$my_array = array(3, 0, 2, 5, -1, 4, 1);
echo "Original Array :\n";
echo implode(', ',$my_array );
echo "\nSorted Array :\n";
echo implode(', ',selection_sort($my_array)). PHP_EOL;
?>

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 Selection sort

PHP Code Editor:

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