search
HomeBackend DevelopmentPHP TutorialPHP shuffles array, retaining key names
PHP shuffles array, retaining key namesMar 21, 2024 pm 01:46 PM
phparrayperformancephp programmingBackend DevelopmentupsetarrangementReserved key names

PHP editor Xinyi introduces you to an interesting array operation method-shuffle the array and retain the key names. In PHP, random arrangement of array elements can be easily achieved through the shuffle function, but the indexes will be reassigned. If you want to retain the original key names, you can first use the array_keys function to obtain the key name array, then scramble it together with the value array, and finally recombine it into a new array through the array_combine function. In this way, you can achieve random arrangement of array elements while retaining the key names!

PHP shuffle the array and keep the key names

In php, use the shuffle() function to shuffle the order of the array, but the key names will not be preserved. To preserve key names, you can use the following method:

Method 1: Use array_rand()

$array = ["a" => 1, "b" => 2, "c" => 3];

$keys = array_rand($array);
$shuffled_array = [];

foreach ($keys as $key) {
$shuffled_array[$key] = $array[$key];
}

Method 2: Use mt_rand()

$array = ["a" => 1, "b" => 2, "c" => 3];

$keys = array_keys($array);
shuffle($keys);

$shuffled_array = [];

foreach ($keys as $key) {
$shuffled_array[$key] = $array[$key];
}

Method 3: Using third-party libraries

Third-party libraries, such as ArrayLib, provide a more convenient way to shuffle arrays and retain key names:

use ArrayLibArrays;

$array = ["a" => 1, "b" => 2, "c" => 3];

$shuffled_array = Arrays::shuffle($array);

Performance comparison

There are differences in the performance of these three methods:

  • array_rand() Performs best with small arrays, but is less efficient with large arrays.
  • mt_rand() Performs well across all array sizes.
  • Third-party libraries generally perform better than native PHP functions.

scenes to be used

Disrupting the array and retaining key names is useful in the following scenarios:

  • When you need to disrupt the order of elements in an array while still needing to access the key of each element.
  • When you need to generate a random playlist or other ordered itemlist.
  • When you need to randomly sample the data in the array.

Precautions

  • array_rand() and mt_rand() return a key, not a value. Need to use $array[$key] to get the value.
  • Third-party libraries may need to be installed before they can be used.
  • Make sure to copy the array before shuffling it to avoid modifying the original array.

The above is the detailed content of PHP shuffles array, retaining key names. For more information, please follow other related articles on the PHP Chinese website!

Statement
This article is reproduced at:编程网. If there is any infringement, please contact admin@php.cn delete
如何优化Java开发中的文件压缩解压性能如何优化Java开发中的文件压缩解压性能Jul 01, 2023 am 11:54 AM

如何优化Java开发中的文件压缩解压性能随着互联网技术的不断发展,文件传输和存储成为我们日常开发中经常遇到的需求。为了减小网络传输的带宽消耗和文件存储的空间占用,我们通常需要对文件进行压缩。在Java开发中,常用的文件压缩格式有ZIP和GZIP。本文将介绍如何优化Java开发中的文件压缩解压性能,帮助提高效率。一、合理选择压缩算法在Java开发中,进行文件压

电脑性能看哪些方面电脑性能看哪些方面Dec 23, 2020 pm 01:54 PM

电脑性能看如下几个方面:1、电脑安装的操作系统的版本;2、电脑所配置的处理器类型;3、电脑安装的内存大小;4、操作系统是32位的还是64位的。

Java开发中如何优化字符串查找性能Java开发中如何优化字符串查找性能Jun 29, 2023 am 11:12 AM

在Java开发中,字符串查找是一个常见且关键的操作。无论是在文本处理、数据分析还是系统日志分析等应用场景中,字符串的查找性能都对程序的整体性能有着重要影响。因此,如何优化字符串查找性能成为了Java开发中不可忽视的问题。一、使用indexOf()方法代替contains()方法在字符串查找中,Java提供了两个常用的方法:indexOf()和contains

Java随机数生成性能优化方法Java随机数生成性能优化方法Jun 30, 2023 pm 12:25 PM

如何优化Java开发中的随机数生成性能随机数在计算机科学中有广泛的应用,特别是在密码学、模拟、游戏等领域。在Java开发中,我们常常需要生成随机数来满足各种需求。然而,随机数生成的性能通常是开发者关注的问题之一。本文将探讨如何优化Java开发中的随机数生成性能。使用ThreadLocalRandom类在Java7中引入了ThreadLocalRandom类

Vue3中的lazy函数详解:懒加载组件提高应用性能Vue3中的lazy函数详解:懒加载组件提高应用性能Jun 19, 2023 am 08:39 AM

Vue3是一款流行的JavaScript框架,它具有易学易用、高效稳定的特点,尤其擅长构建单页应用程序(SPA)。Vue3中的lazy函数,作为懒加载组件的利器之一,可以很大程度上提高应用程序的性能。本文将详解Vue3中的lazy函数的使用方法与原理,以及它在实际开发中的应用场景和优点。什么是懒加载?在传统的前后端分离的开发中,前端开发人员往往需要处理大量的

如何通过设置MySQL缓存来提高性能如何通过设置MySQL缓存来提高性能May 11, 2023 am 08:09 AM

MySQL是一种常用的关系型数据库管理系统(RDBMS),在各种应用场景下都得到广泛的应用。然而,在高并发、大数据量的情况下,MySQL数据库的性能受到挑战,特别是在读写操作频繁的场景下,容易出现性能瓶颈。为了提高MySQL数据库的性能,可以通过设置MySQL缓存来减少数据库的IO操作,从而提高MySQL的查询效率。在本文中,我们将介绍如何通过设置MySQL

一篇学会本地知识库对LLM的性能优化一篇学会本地知识库对LLM的性能优化Jun 12, 2023 am 09:23 AM

昨天一个跑了220个小时的微调训练完成了,主要任务是想在CHATGLM-6B上微调出一个能够较为精确的诊断数据库错误信息的对话模型来。不过这个等了将近十天的训练最后的结果令人失望,比起我之前做的一个样本覆盖更小的训练来,差的还是挺大的。这样的结果还是有点令人失望的,这个模型基本上是没有实用价值的。看样子需要重新调整参数与训练集,再做一次训练。大语言模型的训练是一场军备竞赛,没有好的装备是玩不起来的。看样子我们也必须要升级一下实验室的装备了,否则没有几个十天可以浪费。从最近的几次失败的微调训练来看

自动驾驶决策规划技术详解自动驾驶决策规划技术详解Apr 04, 2023 pm 02:35 PM

随着深度强化学习技术的快速发展,越来越多的研究团队开始将其应用于自动驾驶决策规划中,将行为决策与运动规划模块相融合,直接学习得到行驶轨迹。 自动驾驶中的决策规划模块是衡量和评价自动驾驶能力最核心的指标之一,它的主要任务是在接收到传感器的各种感知信息之后,对当前环境作出分析,然后对底层控制模块下达指令。典型的决策规划模块可以分为三个层次:全局路径规划、行为决策、运动规划。01 引言在一套完整的自动驾驶系统中,如果将感知模块比作人的眼睛和耳朵,那么决策规划就是自动驾驶的大脑。大脑在接收到传感器的各种

See all articles

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)
2 weeks agoBy尊渡假赌尊渡假赌尊渡假赌
Repo: How To Revive Teammates
4 weeks agoBy尊渡假赌尊渡假赌尊渡假赌
Hello Kitty Island Adventure: How To Get Giant Seeds
4 weeks agoBy尊渡假赌尊渡假赌尊渡假赌

Hot Tools

SublimeText3 Mac version

SublimeText3 Mac version

God-level code editing software (SublimeText3)

Dreamweaver CS6

Dreamweaver CS6

Visual web development tools

ZendStudio 13.5.1 Mac

ZendStudio 13.5.1 Mac

Powerful PHP integrated development environment

Safe Exam Browser

Safe Exam Browser

Safe Exam Browser is a secure browser environment for taking online exams securely. This software turns any computer into a secure workstation. It controls access to any utility and prevents students from using unauthorized resources.

PhpStorm Mac version

PhpStorm Mac version

The latest (2018.2.1) professional PHP integrated development tool