PHP implementation of fast sorting method function code

Source: Internet
Author: User
Code Listing 1:
Copy the code code as follows:
<?php
function Quicksort ($STR) {
if (count ($str) <=1) return $str;//If the number is not greater than one, return directly
$key = $str [0];//takes a value, which is later used for comparison;
$left _arr=array ();
$right _arr=array ();
for ($i =1; $i <count ($STR), $i + +) {//is larger than $key on the right, small on the left;
if ($str [$i]<= $key)
$left _arr[]= $str [$i];
Else
$right _arr[]= $str [$i];
}
$left _arr=quicksort ($left _arr);//recursive;
$right _arr=quicksort ($right _arr);
Return Array_merge ($left _arr,array ($key), $right _arr);//Combine the values in the left and right into an array;
}//Below is the test
$str =array (5,3,8,2,5,9,7,2,1,4,0);
Print_r (Quicksort ($STR));
?>

Code Listing 2:
Copy the code code as follows:
/* Fast Sorting Method */
function QuickSort ($left, $right, $arr) {
$l = $left;
$r = $right;
$pivot = $arr [($left + $right)/2];
$temp = 0;

while ($l < $r) {
while ($arr [$l]< $pivot) {
$l + +;
}
while ($arr [$r]> $pivot) {
$r--;
}

if ($l >= $r) break;

$temp = $arr [$l];
$arr [$l] = $arr [$r];
$arr [$r] = $temp;

if ($arr [$l]== $pivot)--$r;
if ($arr [$r]== $pivot) + + $l;
}

if ($l = = $r) {
$l + +;
$r--;
}

if ($left < $r) {
QuickSort ($left, $r, $arr);
}elseif ($right > $l) {
QuickSort ($l, $right, $arr);
}else{
return $arr;
}
}
  • Contact Us

    The content source of this page is from Internet, which doesn't represent Alibaba Cloud's opinion; products and services mentioned on that page don't have any relationship with Alibaba Cloud. If the content of the page makes you feel confusing, please write us an email, we will handle the problem within 5 days after receiving your email.

    If you find any instances of plagiarism from the community, please send an email to: info-contact@alibabacloud.com and provide relevant evidence. A staff member will contact you within 5 working days.

    A Free Trial That Lets You Build Big!

    Start building with 50+ products and up to 12 months usage for Elastic Compute Service

    • Sales Support

      1 on 1 presale consultation

    • After-Sales Support

      24/7 Technical Support 6 Free Tickets per Quarter Faster Response

    • Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.