QuickSortIn-placeImplementation，quicksort_PHP教程

Quick Sort In-place Implementation，quicksort

在线运行PHP http://www.compileonline.com/execute_php_online.php

 1 php
 2 function swap( &$a, &$b )
 3 {
 4     $c = $a;
 5     $a = $b;
 6     $b = $c;
 7 }
 8 
 9 /**
10 * quick sort
11 * ascend
12 * in-place
13 */
14 function quick_sort( &$a )
15 {
16     $s = count( $a ); // size of a
17     if ( $s < 2 ) return;
18     $i = 0; // index of pivot, for tracking pivot
19     $pivot = $a[$i];
20     $l = 0; // swap listener, if listens no swap, sort fini
21 
22     // swap those smaller than pivot to the left
23     for ( $m = 0; $m < $s; $m++ )
24     {
25         if ( $a[$m] < $a[$i] )
26         {
27             swap( $a[$m], $a[$i] );
28             $i = $m;
29             $l++;
30         }
31     }
32 
33     // swap those larger than pivot to the right
34     for ( $n = 0; $n < $i; $n++)
35     {
36         if ( $a[$n] > $a[$i] )
37         {
38             swap( $a[$n], $a[$i] );
39             $i = $n;
40             $l++;
41         }
42     }
43 
44     if ( $l == 0 ) return;
45     else $l = 0;
46     quick_sort( $a );
47 }
48 
49 $arr = range( 9, 0 );
50 quick_sort( $arr );
51 echo implode( ', ', $arr );
52 ?>

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