


We all know that there are many ways to delete array elements in PHP. The commonly used function is array_unique() in PHP. Then the PHP function array_flip() we introduce to you today is about 5 times more efficient than the array_unique() function in deleting duplicate elements from an array.
PHP function array_flip() format:
array array_flip ( array trans )
//array_flip -- Swap the keys and values in the array
array array_flip ( array trans ) //array_flip -- Swap the keys and values in the array
method As follows:
$arr = array(…………);//Suppose there is a An array of 10,000 elements contains duplicate elements.
$arr = array_flip(array_flip($arr)); //This way duplicate elements can be deleted.
What on earth is going on? Let’s take a look at the function of array_flip(): The PHP function array_flip() is used to exchange the key and value of each element of an array, such as:
$arr1 = array ("age" => 30, "name" => "Script Home");
$arr2 = array_flip($arr1) ; //$arr2 is array(30 => "age", "Script Home" => "name");
In the PHP array, different elements are allowed to be taken The same value, but the same key name is not allowed to be used by different elements, such as:
$arr1 = array ("age" => 30, "name" => "Script Home", "age" => 20); "age" => 20 will replace "age" => ; 30
$arr1 = array ("name" => "Script Home", "age" => 20);
Here $arr1 and $arr2 are equal.
So, we can know why array_flip(array_flip($arr)) can delete duplicate elements in the array. First, the value in $arr will become a key name, because the value is repeated. After becoming a key name, these repeated values will become duplicate key names. The PHP engine will delete the duplicate key names and only keep the last one. . For example:
$arr1 = array ("age" => 30, "name" => "Script Home", "age" => 20);
$arr1 = array_flip($arr1); //$arr1 becomes array("Script Home" => "name" , 20 => "age");
//Restore the key name and value of $arr1:
$arr1 = array_flip($arr1);
The above PHP The code of the function array_flip() is written more concisely:
$arr1 = array_flip(array_flip ($arr1));

Python编程解析百度地图API文档中的坐标转换功能导读:随着互联网的快速发展,地图定位功能已经成为现代人生活中不可或缺的一部分。而百度地图作为国内最受欢迎的地图服务之一,提供了一系列的API供开发者使用。本文将通过Python编程,解析百度地图API文档中的坐标转换功能,并给出相应的代码示例。一、引言在开发中,我们有时会涉及到坐标的转换问题。百度地图AP

Python解析XML中的特殊字符和转义序列XML(eXtensibleMarkupLanguage)是一种常用的数据交换格式,用于在不同系统之间传输和存储数据。在处理XML文件时,经常会遇到包含特殊字符和转义序列的情况,这可能会导致解析错误或者误解数据。因此,在使用Python解析XML文件时,我们需要了解如何处理这些特殊字符和转义序列。一、特殊字符和

随着PHP8.0的发布,许多新特性都被引入和更新了,其中包括XML解析库。PHP8.0中的XML解析库提供了更快的解析速度和更好的可读性,这对于PHP开发者来说是一个重要的提升。在本文中,我们将探讨PHP8.0中的XML解析库的新特性以及如何使用它。什么是XML解析库?XML解析库是一种软件库,用于解析和处理XML文档。XML是一种用于将数据存储为结构化文档

使用Python解析SOAP消息SOAP(SimpleObjectAccessProtocol)是一种基于XML的远程过程调用(RPC)协议,用于在网络上不同的应用程序之间进行通信。Python提供了许多库和工具来处理SOAP消息,其中最常用的是suds库。suds是Python的一个SOAP客户端库,可以用于解析和生成SOAP消息。它提供了一种简单而

使用Python解析带有命名空间的XML文档XML是一种常用的数据交换格式,能够适应各种应用场景。在处理XML文档时,有时会遇到带有命名空间(namespace)的情况。命名空间可以防止不同XML文档中元素名的冲突,提高了XML的灵活性和可扩展性。本文将介绍如何使用Python解析带有命名空间的XML文档,并给出相应的代码示例。首先,我们需要导入xml.et

PHP爬虫是一种自动化获取网页信息的程序,它可以获取网页代码、抓取数据并存储到本地或数据库中。使用爬虫可以快速获取大量的数据,为后续的数据分析和处理提供巨大的帮助。本文将介绍如何使用PHP实现一个简单的爬虫,以获取网页源码和内容解析。一、获取网页源码在开始之前,我们应该先了解一下HTTP协议和HTML的基本结构。HTTP是HyperText

PHP中的单点登录(SSO)鉴权方法解析引言:随着互联网的发展,用户通常要同时访问多个网站进行各种操作。为了提高用户体验,单点登录(SingleSign-On,简称SSO)应运而生。本文将探讨PHP中的SSO鉴权方法,并提供相应的代码示例。一、什么是单点登录(SSO)?单点登录(SSO)是一种集中化认证的方法,在多个应用系统中,用户只需要登录一次,就能访问

PHP中的HTTPBasic鉴权方法解析及应用HTTPBasic鉴权是一种简单但常用的身份验证方法,它通过在HTTP请求头中添加用户名和密码的Base64编码字符串进行身份验证。本文将介绍HTTPBasic鉴权的原理和使用方法,并提供PHP代码示例供读者参考。一、HTTPBasic鉴权原理HTTPBasic鉴权的原理非常简单,当客户端发送一个请求时


Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

AI Hentai Generator
Generate AI Hentai for free.

Hot Article

Hot Tools

DVWA
Damn Vulnerable Web App (DVWA) is a PHP/MySQL web application that is very vulnerable. Its main goals are to be an aid for security professionals to test their skills and tools in a legal environment, to help web developers better understand the process of securing web applications, and to help teachers/students teach/learn in a classroom environment Web application security. The goal of DVWA is to practice some of the most common web vulnerabilities through a simple and straightforward interface, with varying degrees of difficulty. Please note that this software

Atom editor mac version download
The most popular open source editor

Dreamweaver Mac version
Visual web development tools

PhpStorm Mac version
The latest (2018.2.1) professional PHP integrated development tool

SecLists
SecLists is the ultimate security tester's companion. It is a collection of various types of lists that are frequently used during security assessments, all in one place. SecLists helps make security testing more efficient and productive by conveniently providing all the lists a security tester might need. List types include usernames, passwords, URLs, fuzzing payloads, sensitive data patterns, web shells, and more. The tester can simply pull this repository onto a new test machine and he will have access to every type of list he needs.
