search
HomeBackend DevelopmentPHP TutorialPHP的一些案例研究(二)

一、mysql学习:

1、完成数据表导出为xml文件(命令行,mysql.exe)、csv文件(outfile);
2、命令行导出指定记录,生成sql文件(mysqldump);
3、sql语句查询记录,并插入到指定表(insert...select...where....);
4、myisam表的简单修复(myisamchk -r table);
5、CASE WHEN的使用,
SELECT CASE 
WHEN 10*2=30 THEN '30 correct'
   WHEN 10*2=40 THEN '40 correct'
   ELSE 'Should be 10*2=20'
END; 。

 二、利用成语接龙api接口抓取对方数据库成语:

1、手工测试成语的准确性;经测试输入不是成语或者没有解词时,返回成语失败;输入同一成语可能返回不同的解词;
2、构建数据表,书写程序;预先设定一个成语,然后把返回结果入库,之后就不停的请求库里的成语,将返回结果入库并以此进行下一步请求;
 
3、开始成语:一马当先
运行时间 成语数
1小时20分 4900左右
2小时 7100左右
1天(停止过2次,时间不知) 18178左右
2天(有停止过) 29,197
已不能采集,不知道是否被限制了
4、成语应该也就三万左右的样子。

三、Javascript Regular Expression Visualizer:

 
1、纯js代码,提供了正则可视化、图片输出、嵌入到网页的功能;
2、可视化就是把js正则以图形的形式表现出来;图片输出是把正则图形化后生成图片,应该是网页标签截图;嵌入到网页是使用iframe。
 

四、基于jquery的webweb弹层组件??layer学习使用:

基于juqery1.8以上版本,代码简单,提供体验友好的弹出层,共有信息框、页面层、iframe层、加载层、tips层。
 
 
 

五、研读《阿里巴巴集团web安全标准》

不要相信用户的任何输入;用户标识,保证不会被hacker伪装;代码规范。
StringUtil.htmlEscape() TOKEN
 

六、测试一台计算机是否开机

    $rs=`ping 10.10.10.123`;
     $status=preg_match('%TTL=\d+%',$rs)?'yes':'no';
    echo $status;
?>
前提:运行php的服务器有操作系统命令的权限
 

七、雪花飘落插件

雪花是一张图片,通过控制图片的尺寸可以控制雪花的大小,然后用js控制悬浮在不同的层,呈飘落状。
 

八、猜拳小游戏---传统的石头剪刀布的web版

使用一个随机数来确定电脑的值,然后把电脑的值和用户选择的值进行对比,确定胜负。
主要代码:
Guess.onclick =function(){
var num = Math.floor(Math.random()*3 +1 );
  if (num==1) {
    computer.value="石头";
} else if (num==2) {
computer.value="剪刀";
} else if(num==3) {
computer.value="布";
}
var mineValue = mine.value;
var computerValue = computer.value;
if (mineValue==computerValue) {
alert("平局")
} else if (mineValue=="剪刀") {
alert(computerValue=="石头"?"you win":"lost")
} else if (mineValue=="石头") {
alert(computerValue=="布"?"you win":"lost")
} else if (mineValue=="布") {
alert(computerValue=="剪刀"?"you win":"lost")
}
mine.value ="";
computer.value ="";
}
 

九、幻灯片展示框架 Fathom.js

 
使用 HTML 和 CSS 实现了在浏览器上的幻灯片展示效果,基于 jQuery 开发,横向滑动条显示幻灯片。

Statement
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
What are some common problems that can cause PHP sessions to fail?What are some common problems that can cause PHP sessions to fail?Apr 25, 2025 am 12:16 AM

Reasons for PHPSession failure include configuration errors, cookie issues, and session expiration. 1. Configuration error: Check and set the correct session.save_path. 2.Cookie problem: Make sure the cookie is set correctly. 3.Session expires: Adjust session.gc_maxlifetime value to extend session time.

How do you debug session-related issues in PHP?How do you debug session-related issues in PHP?Apr 25, 2025 am 12:12 AM

Methods to debug session problems in PHP include: 1. Check whether the session is started correctly; 2. Verify the delivery of the session ID; 3. Check the storage and reading of session data; 4. Check the server configuration. By outputting session ID and data, viewing session file content, etc., you can effectively diagnose and solve session-related problems.

What happens if session_start() is called multiple times?What happens if session_start() is called multiple times?Apr 25, 2025 am 12:06 AM

Multiple calls to session_start() will result in warning messages and possible data overwrites. 1) PHP will issue a warning, prompting that the session has been started. 2) It may cause unexpected overwriting of session data. 3) Use session_status() to check the session status to avoid repeated calls.

How do you configure the session lifetime in PHP?How do you configure the session lifetime in PHP?Apr 25, 2025 am 12:05 AM

Configuring the session lifecycle in PHP can be achieved by setting session.gc_maxlifetime and session.cookie_lifetime. 1) session.gc_maxlifetime controls the survival time of server-side session data, 2) session.cookie_lifetime controls the life cycle of client cookies. When set to 0, the cookie expires when the browser is closed.

What are the advantages of using a database to store sessions?What are the advantages of using a database to store sessions?Apr 24, 2025 am 12:16 AM

The main advantages of using database storage sessions include persistence, scalability, and security. 1. Persistence: Even if the server restarts, the session data can remain unchanged. 2. Scalability: Applicable to distributed systems, ensuring that session data is synchronized between multiple servers. 3. Security: The database provides encrypted storage to protect sensitive information.

How do you implement custom session handling in PHP?How do you implement custom session handling in PHP?Apr 24, 2025 am 12:16 AM

Implementing custom session processing in PHP can be done by implementing the SessionHandlerInterface interface. The specific steps include: 1) Creating a class that implements SessionHandlerInterface, such as CustomSessionHandler; 2) Rewriting methods in the interface (such as open, close, read, write, destroy, gc) to define the life cycle and storage method of session data; 3) Register a custom session processor in a PHP script and start the session. This allows data to be stored in media such as MySQL and Redis to improve performance, security and scalability.

What is a session ID?What is a session ID?Apr 24, 2025 am 12:13 AM

SessionID is a mechanism used in web applications to track user session status. 1. It is a randomly generated string used to maintain user's identity information during multiple interactions between the user and the server. 2. The server generates and sends it to the client through cookies or URL parameters to help identify and associate these requests in multiple requests of the user. 3. Generation usually uses random algorithms to ensure uniqueness and unpredictability. 4. In actual development, in-memory databases such as Redis can be used to store session data to improve performance and security.

How do you handle sessions in a stateless environment (e.g., API)?How do you handle sessions in a stateless environment (e.g., API)?Apr 24, 2025 am 12:12 AM

Managing sessions in stateless environments such as APIs can be achieved by using JWT or cookies. 1. JWT is suitable for statelessness and scalability, but it is large in size when it comes to big data. 2.Cookies are more traditional and easy to implement, but they need to be configured with caution to ensure security.

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

Video Face Swap

Video Face Swap

Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Tools

SAP NetWeaver Server Adapter for Eclipse

SAP NetWeaver Server Adapter for Eclipse

Integrate Eclipse with SAP NetWeaver application server.

DVWA

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

EditPlus Chinese cracked version

EditPlus Chinese cracked version

Small size, syntax highlighting, does not support code prompt function

PhpStorm Mac version

PhpStorm Mac version

The latest (2018.2.1) professional PHP integrated development tool

SublimeText3 Linux new version

SublimeText3 Linux new version

SublimeText3 Linux latest version