(php mascot-elephant)What is php? PHP (foreign name: PHP: Hypertext Preprocessor, Chinese name: "Hypertext Preprocessor") is a general open source scripting language. The syntax absorbs the characteristics of C language, Java and Perl, which is easy to learn and widely used. It is mainly suitable for the field of Web development. PHP's unique syntax mixes C, Java, Perl, and PHP's own syntax. It can execute dynamic web pages faster than CGI or Perl. Compared with other programming languages, dynamic pages made with PHP embed programs into HTML (an application under the Standard Universal Markup Language) document for execution, and the execution efficiency is much higher than CGI that completely generates HTML tags; PHP can also execute compiled code. Compilation can achieve encryption and optimize code running, making the code run faster. php’s previous life PHP1 PHP originally emerged as a fast, practical toolkit. In 1994, in order to add a small and practical visitor tracking system to his website, Rasmus Lerdorf compiled
1. 10 recommended articles about what php is
Introduction: (php mascot - elephant) What is php? PHP (foreign name: PHP: Hypertext Preprocessor, Chinese name: "Hypertext Preprocessor") is a general open source scripting language. The syntax absorbs the characteristics of C language, Java and Perl, which is easy to learn and widely used. It is mainly suitable for the field of Web development. PHP's unique syntax mixes C, Java, Perl, and PHP's own syntax. It can execute dynamic web pages faster than CGI or Perl. Dynamic pages and other programming made with PHP...
2. 10 recommended content of mysql_stat
Introduction: This article summarizes the solutions to MYSQL is marked as crashed and should be repaired. Friends in need can refer to it. Problem Analysis The cause of the error. Some netizens said that it was an index error caused by frequent querying and updating of the [Data Table] table. Because my page was not statically generated, but a dynamic page, I quite agree with this. statement. There is also a saying that it is a MYSQL database because of some...
3. 10 recommended articles about the mysql_stat() function
Introduction: This article summarizes the solutions to MYSQL is marked as crashed and should be repaired. Friends in need can refer to it. Problem analysis: The cause of the error was analyzed. Some netizens said that it was an index error caused by frequent querying and updating of the [data table] table. Because my page was not statically generated, but a dynamic page, I quite agree with this statement. It is also said that the MYSQL database has been damaged for some reason, such as: sudden power outage of the database server,...
4. php Summary of how to use pseudo-static technology
##Introduction: When one page jumps to another page, then All parameters on this page will be discarded. Dynamic pages generally use URL addresses to save all parameters on the page. In this way, when the search engine selects the page, it may enter an endless loop due to question marks.
5. Detailed explanation of sample code analysis of html static pages to implement WeChat sharing ideas
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CSS Tutorial (8) Briefly introduce the use of CSS combined with JS Introduction: 8. Briefly introduce the use of CSS combined with JS (for event actions) using CSS and javascript to create many cooler dynamic pages At the end of this tutorial, I will give you a brief introduction to the application of CSS and JS. First, we need to understand the concepts of events and actions. In client-side scripting, javascript obtains interaction with the user by responding to events. For example, when the user clicks a button 7. Detailed explanation of the method of converting JSP dynamic page to HTML static page Introduction: This article mainly explains in detail the method of converting JSP dynamic pages to HTML static pages. It has certain reference value. Interested friends can refer to it 8. Detailed explanation of the code for generating dynamic pages using XML and XSL ##Introduction: XML (Extensible Markup Language) may look like some kind of W3C standard - it has no practical impact now, and even if it comes in handy later, it will be a long time later. But in fact, it is already being used. So, don't wait until XML is added to your favorite HTML editor to start using it. It can solve various internal problems and b2b system problems now. 9. Detailed explanation of how to use python crawler tool Selenium Introduction: When using python to crawl dynamic pages, ordinary urllib2 cannot be implemented. For example, on the JD.com homepage below, new content will be loaded as the scroll bar is pulled down, and urllib2 cannot crawl these contents. At this time, it is necessary Today’s protagonist is selenium. 10. What is php again? On the past and present life of PHP [Related Q&A recommendations]: java - include tag cache processing issuesphp - About using crawlers Does the program crawl those dynamic pages with js rendering data? Front-end - How are these dynamic pages made? How high are the requirements for front-end internships in 2017? How should newbies prepare? nginx - php configuration problem
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Explain the concept of a PHP session in simple terms.Apr 26, 2025 am 12:09 AMPHPsessionstrackuserdataacrossmultiplepagerequestsusingauniqueIDstoredinacookie.Here'showtomanagethemeffectively:1)Startasessionwithsession_start()andstoredatain$_SESSION.2)RegeneratethesessionIDafterloginwithsession_regenerate_id(true)topreventsessi
How do you loop through all the values stored in a PHP session?Apr 26, 2025 am 12:06 AMIn PHP, iterating through session data can be achieved through the following steps: 1. Start the session using session_start(). 2. Iterate through foreach loop through all key-value pairs in the $_SESSION array. 3. When processing complex data structures, use is_array() or is_object() functions and use print_r() to output detailed information. 4. When optimizing traversal, paging can be used to avoid processing large amounts of data at one time. This will help you manage and use PHP session data more efficiently in your actual project.
Explain how to use sessions for user authentication.Apr 26, 2025 am 12:04 AMThe session realizes user authentication through the server-side state management mechanism. 1) Session creation and generation of unique IDs, 2) IDs are passed through cookies, 3) Server stores and accesses session data through IDs, 4) User authentication and status management are realized, improving application security and user experience.
Give an example of how to store a user's name in a PHP session.Apr 26, 2025 am 12:03 AMTostoreauser'snameinaPHPsession,startthesessionwithsession_start(),thenassignthenameto$_SESSION['username'].1)Usesession_start()toinitializethesession.2)Assigntheuser'snameto$_SESSION['username'].Thisallowsyoutoaccessthenameacrossmultiplepages,enhanc
What are some common problems that can cause PHP sessions to fail?Apr 25, 2025 am 12:16 AMReasons 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?Apr 25, 2025 am 12:12 AMMethods 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?Apr 25, 2025 am 12:06 AMMultiple 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?Apr 25, 2025 am 12:05 AMConfiguring 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.
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mPDF
mPDF is a PHP library that can generate PDF files from UTF-8 encoded HTML. The original author, Ian Back, wrote mPDF to output PDF files "on the fly" from his website and handle different languages. It is slower than original scripts like HTML2FPDF and produces larger files when using Unicode fonts, but supports CSS styles etc. and has a lot of enhancements. Supports almost all languages, including RTL (Arabic and Hebrew) and CJK (Chinese, Japanese and Korean). Supports nested block-level elements (such as P, DIV),
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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
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