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How to implement selection sorting in PHP?

藏色散人
藏色散人Original
2019-03-06 13:57:423091browse

Selection sort is improved on the basis of Bubble sort, and only one pass exchange is performed each time it passes through the list. Simply put, the principle of selection sort is to select the smallest (or largest) element from the data elements to be sorted each time and store it at the beginning of the sequence until all the data elements to be sorted are exhausted. Selection sort is an unstable sorting method.

How to implement selection sorting in PHP?

The code example of PHP selection sorting is as follows:

<?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;
}
$my_array = array(3, 0, 2, 5, -1, 4, 1);
echo "原始数组:\n";
echo implode(&#39;, &#39;,$my_array );
echo "\n排序后数组:\n";
echo implode(&#39;, &#39;,selection_sort($my_array)). PHP_EOL;

Output:

原始数组: 3, 0, 2, 5, -1, 4, 1 
排序后数组: -1, 0, 1, 2, 3, 4, 5

This article is about PHP selection sorting The implementation method is introduced, I hope it will be helpful to friends who need it!

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