Table of Contents
PHP版本常用的排序算法汇总,
您可能感兴趣的文章:
Home php教程 php手册 PHP版本常用的排序算法汇总,

PHP版本常用的排序算法汇总,

Jun 13, 2016 am 08:48 AM
php Sorting Algorithm

PHP版本常用的排序算法汇总,

//1、冒泡排序

function bubble_sort($arr){
  $n = count($arr);
  for($i=0;$i<$n-1;$i++){
    for($j=$i+1;;$j<$n-$i;$j++){
      if($arr[$j]<$arr[$i]){
        $temp = $arr[$i];
        $arr[$i] = $arr[$j];
        $arr[$j] = $temp;
      }
    }
  }
}
Copy after login

//2、归并排序

//merge函数将指定的两个有序数组(arr1arr2,)合并并且排序
//我们可以找到第三个数组,然后依次从两个数组的开始取数据哪个数据小就先取哪个的,然后删除掉刚刚取过///的数据
function al_merge($arrA, $arrB)
{
$arrC = array();
while (count($arrA) && count($arrB)) {
//这里不断的判断哪个值小,就将小的值给到arrC,但是到最后肯定要剩下几个值,
//不是剩下arrA里面的就是剩下arrB里面的而且这几个有序的值,肯定比arrC里面所有的值都大所以使用
$arrC[] = $arrA['0'] < $arrB['0'] &#63; array_shift($arrA) : array_shift($arrB);
}
return array_merge($arrC, $arrA, $arrB);
}

//归并排序主程序
function al_merge_sort($arr)
{
$len = count($arr);
if ($len <= 1) {
return $arr; //递归结束条件,到达这步的时候,数组就只剩下一个元素了,也就是分离了数组
}
$mid = intval($len / 2); //取数组中间
$left_arr = array_slice($arr, 0, $mid); //拆分数组0-mid这部分给左边left_arr
$right_arr = array_slice($arr, $mid); //拆分数组mid-末尾这部分给右边right_arr
$left_arr = al_merge_sort($left_arr); //左边拆分完后开始递归合并往上走
$right_arr = al_merge_sort($right_arr); //右边拆分完毕开始递归往上走
$arr = al_merge($left_arr, $right_arr); //合并两个数组,继续递归
return $arr;
}

$arr = array(12, 5, 4, 7, 8, 3, 4, 2, 6, 4, 9);
print_r(al_merge_sort($arr));

Copy after login

//3、二分查找-递归

//二分查找-递归
function bin_search($array,$low,$high,$k){
  if($low <= $high){
    $mid = intval(($low+$high)/2);
  }else{
    return false;
  }
  if($array[$mid] == $k){
    return $mid;
  }elseif($k < $array[$mid]){
    return bin_search($array,$low,$mid-1,$k);
  }else{
    return bin_search($array,$mid+1,$high,$k);
  }
}
$arr = array(12, 5, 4, 7, 3, 8, 4, 2, 6, 4, 9);
$index = bin_search($arr,0,10,12); //直接输出为空,不解
echo(intval($index));

Copy after login

//4、二分查找-非递归

function bin_search($arr,$low,$high,$value) {//$arr 数组; $slow 最小索引; $high 最大索引 $value 查找的值
  while($low<=$high) { 
    $mid=intval(($low+$high)/2); 
    if($value==$arr[$mid]){
      return $mid; 
    }elseif($value<$arr[$mid]){
      $high=$mid-1; 
    }else{
      $low=$mid+1; 
    } 
  }
  return false; 
}

Copy after login

//5、快速排序

function quick_sort($arr) {
  $n=count($arr);
  if($n<=1)
    return $arr;
  $key=$arr[0];
  $left_arr=array();
  $right_arr=array();
  for($i=1;$i<$n;$i++) {
    if($arr[$i]<=$key)
      $left_arr[]=$arr[$i];
    else
      $right_arr[]=$arr[$i];
  }
  $left_arr=quick_sort($left_arr);
  $right_arr=quick_sort($right_arr);
  return array_merge($left_arr,array($key),$right_arr);
}

Copy after login

//6、选择排序

function select_sort($arr) {
  $n=count($arr);
  for($i=0;$i<$n;$i++) {
    $k=$i;
    for($j=$i+1;$j<$n;$j++) {
      if($arr[$j]<$arr[$k])
        $k=$j;
    }
    if($k!=$i) {
      $temp=$arr[$i];
      $arr[$i]=$arr[$k];
      $arr[$k]=$temp;
    }
  }
  return $arr;
}

Copy after login

//7、插入排序

function insertSort($arr) {
  $n=count($arr);
  for($i=1;$i<$n;$i++) {
    $tmp=$arr[$i];
    $j=$i-1;
    while($arr[$j]>$tmp) {
      $arr[$j+1]=$arr[$j];
      $arr[$j]=$tmp;
      $j--;
      if($j<0)
        break;
    }
  }
  return $arr;
}

Copy after login

您可能感兴趣的文章:

  • PHP 各种排序算法实现代码
  • PHP 冒泡排序算法的实现代码
  • php排序算法(冒泡排序,快速排序)
  • PHP 冒泡排序 二分查找 顺序查找 二维数组排序算法函数的详解
  • PHP 快速排序算法详解
  • PHP简单选择排序算法实例
Statement of this Website
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn

Hot AI Tools

Undresser.AI Undress

Undresser.AI Undress

AI-powered app for creating realistic nude photos

AI Clothes Remover

AI Clothes Remover

Online AI tool for removing clothes from photos.

Undress AI Tool

Undress AI Tool

Undress images for free

Clothoff.io

Clothoff.io

AI clothes remover

AI Hentai Generator

AI Hentai Generator

Generate AI Hentai for free.

Hot Article

R.E.P.O. Energy Crystals Explained and What They Do (Yellow Crystal)
3 weeks ago By 尊渡假赌尊渡假赌尊渡假赌
R.E.P.O. Best Graphic Settings
3 weeks ago By 尊渡假赌尊渡假赌尊渡假赌
R.E.P.O. How to Fix Audio if You Can't Hear Anyone
3 weeks ago By 尊渡假赌尊渡假赌尊渡假赌
WWE 2K25: How To Unlock Everything In MyRise
3 weeks ago By 尊渡假赌尊渡假赌尊渡假赌

Hot Tools

Notepad++7.3.1

Notepad++7.3.1

Easy-to-use and free code editor

SublimeText3 Chinese version

SublimeText3 Chinese version

Chinese version, very easy to use

Zend Studio 13.0.1

Zend Studio 13.0.1

Powerful PHP integrated development environment

Dreamweaver CS6

Dreamweaver CS6

Visual web development tools

SublimeText3 Mac version

SublimeText3 Mac version

God-level code editing software (SublimeText3)

PHP 8.4 Installation and Upgrade guide for Ubuntu and Debian PHP 8.4 Installation and Upgrade guide for Ubuntu and Debian Dec 24, 2024 pm 04:42 PM

PHP 8.4 brings several new features, security improvements, and performance improvements with healthy amounts of feature deprecations and removals. This guide explains how to install PHP 8.4 or upgrade to PHP 8.4 on Ubuntu, Debian, or their derivati

CakePHP Date and Time CakePHP Date and Time Sep 10, 2024 pm 05:27 PM

To work with date and time in cakephp4, we are going to make use of the available FrozenTime class.

CakePHP File upload CakePHP File upload Sep 10, 2024 pm 05:27 PM

To work on file upload we are going to use the form helper. Here, is an example for file upload.

Discuss CakePHP Discuss CakePHP Sep 10, 2024 pm 05:28 PM

CakePHP is an open-source framework for PHP. It is intended to make developing, deploying and maintaining applications much easier. CakePHP is based on a MVC-like architecture that is both powerful and easy to grasp. Models, Views, and Controllers gu

CakePHP Creating Validators CakePHP Creating Validators Sep 10, 2024 pm 05:26 PM

Validator can be created by adding the following two lines in the controller.

CakePHP Logging CakePHP Logging Sep 10, 2024 pm 05:26 PM

Logging in CakePHP is a very easy task. You just have to use one function. You can log errors, exceptions, user activities, action taken by users, for any background process like cronjob. Logging data in CakePHP is easy. The log() function is provide

How To Set Up Visual Studio Code (VS Code) for PHP Development How To Set Up Visual Studio Code (VS Code) for PHP Development Dec 20, 2024 am 11:31 AM

Visual Studio Code, also known as VS Code, is a free source code editor — or integrated development environment (IDE) — available for all major operating systems. With a large collection of extensions for many programming languages, VS Code can be c

CakePHP Quick Guide CakePHP Quick Guide Sep 10, 2024 pm 05:27 PM

CakePHP is an open source MVC framework. It makes developing, deploying and maintaining applications much easier. CakePHP has a number of libraries to reduce the overload of most common tasks.

See all articles