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- How can you pause and resume a CSS animation?
- To pause and restore CSS animation, the most direct way is to dynamically switch the animation-play-state attribute using JavaScript. Controlling this property through JavaScript allows pause and playback to be achieved without restarting the painting. The specific steps include: 1. Add an event listener (such as button click); 2. Check the current animation status; 3. Dynamic switching status. In addition, if you only need to pause the animation during hover, you can implement it through the :hover pseudo-class combined with @keyframes, but this method is suitable for simple interactions and is not suitable for complex logic. For multiple animations or more complex scenes, you can process animations by index, reset animation state or manage states with CSS variables, and pay attention to performance
- CSS Tutorial . Web Front-end 683 2025-06-30 00:02:12
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- How do I prevent file upload vulnerabilities in PHP?
- To prevent PHP file upload vulnerabilities, you must first strictly control the uploaded content. 1. Always verify file types on the server side, use finfo_file() or mime_content_type() to check the real MIME type, and establish a whitelisting mechanism; 2. Do not trust user input and refuse to rely solely on front-end verification; 3. Rename the file after uploading, and use randomly generated file names to avoid execution risks; 4. Set correct directory permissions and prohibit script execution, such as restricting file type access through .htaccess; 5. Try to store files in non-public directories and provide access services through scripts; 6. Regularly scan uploaded content, strip away image EXIF ??data or reprocess them with ImageMagick
- PHP Tutorial . Backend Development 281 2025-06-29 02:19:10
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- How to check if PHP is installed successfully?
- To check whether PHP is installed successfully, first enter php-v in the terminal; if the version number is displayed such as PHP8.1.12, the environment variables have been installed and configured correctly; if the prompt command is not recognized, you need to check the system PATH settings; secondly, create an info.php file in the root directory of the website and access the test page to confirm whether PHP and the server are integrated normally; finally, Windows users can check whether Apache or PHP service is running through the service manager.
- PHP Tutorial . Backend Development 958 2025-06-29 02:18:50
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- What are array unpacking with string keys in PHP 8.1?
- PHP8.1allowsunpackingassociativearrayswithstringkeysusingthesplatoperator(...),preservingkeysduringunpacking.1.Thisenablescombiningarrayspredictably,suchasmergingformdatawithdefaults.2.Usageinvolvesplacing...beforethearrayvariableinsideanarrayliteral
- PHP Tutorial . Backend Development 568 2025-06-29 02:18:31
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- How to configure the PHP runtime environment?
- The key to configuring the PHP operating environment is to select the appropriate version, match the web server and set the environment variables correctly. 1. Install PHP to select a stable version such as 8.1 or 8.2, and install common extensions such as php-mysql, php-curl, php-gd. Windows users need to manually modify the php.ini file to enable the extension, and Linux users generally enable it automatically; 2. Apache or Nginx can be selected with a web server. Apache needs to load the PHP module in the configuration file and specify PHPIniDir. Nginx uses PHP-FPM through FastCGI. Pay attention to the root and index.php settings. XAMP is available for local testing.
- PHP Tutorial . Backend Development 348 2025-06-29 02:18:11
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- How do I use code linters and formatters to enforce coding standards?
- Yes,youcanusecodelintersandformatterstoenforcecodingstandardsacrossyourprojectorteam.1.Choosetherighttoolsforyourlanguage,suchasESLintandPrettierforJavaScript/TypeScriptorBlackandFlake8forPython.2.Setupsharedconfigurationfileslike.eslintrcor.prettier
- PHP Tutorial . Backend Development 798 2025-06-29 02:17:50
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- PHP environment setup: Manual installation vs. integrated tools
- Newbie people are suitable for using integrated tools. Developers who have customization needs or want to have a deep understanding of the operating mechanism are more suitable for manual installation. Integrated tools (such as XAMPP, WAMP, MAMP or Laragon) package Apache, MySQL, PHP and other components, which are simple to install, convenient to start and stop services, and have adjusted the environment configuration, which is suitable for quick start and save time; while manual installation is suitable for situations where specific versions are required, expansion modules are enabled or customized configurations are enabled. Although there are many steps, you can fully control the details. The choice method must consider the purpose (learning basic development or project customization), the operating system (Laragon or XAMPP recommended by Windows, MAMP or Homebrew can be selected by Mac), and technical capabilities (if you are not familiar with the command line, you will first
- PHP Tutorial . Backend Development 250 2025-06-29 02:17:31
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- What is the difference between PHP 5, PHP 7, and PHP 8?
- The main differences between PHP5, 7, and 8 are reflected in performance, new features, compatibility and security. 1. In terms of performance, PHP7 rewrites ZendEngine 3.0 to make the speed about twice faster than PHP5. PHP8 introduces JIT compilation to further improve the performance of long-term operation and high-computing tasks; 2. In terms of new features, PHP7 adds scalar type declarations, return type declarations and spacecraft operators, and PHP8 adds joint types, named parameters, match expressions and attributes (notations); 3. In terms of compatibility and error handling, PHP7 removes the old deprecated functions, and PHP8 turns many fatal errors into catchable exceptions; 4. In terms of support and security, PHP5 has been stopped in 2018, and PHP7.4 will be 20.
- PHP Tutorial . Backend Development 160 2025-06-29 02:17:11
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- How do I use fibers for concurrent programming in PHP 8.1?
- PHP8.1's Fibers simplifies asynchronous programming through collaborative multitasking. Fibers are lightweight, stackless coroutines that allow manual pause and resume execution; they do not run in parallel and require manual scheduling; they are suitable for building custom concurrency models, especially suitable for I/O-intensive applications such as HTTP servers; when using them, you need to create Fiber objects and call the start or resume method; non-blocking I/O operations can be managed through integrated event loops; but it should be noted that they do not have real parallelism, exception propagation, limited ecosystem support, and experimental state.
- PHP Tutorial . Backend Development 178 2025-06-29 02:16:51
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- What are variable scopes in PHP (global, local, static)?
- There are three main scopes of variables in PHP: global, local and static. 1. Global scope refers to variables declared outside the function and can only be accessed outside the function. If it needs to be used inside the function, it must be introduced with the global keyword; 2. Local scope refers to variables declared inside the function, which are only valid inside the function, and the variables are destroyed after the function is executed; 3. Static scope is implemented through the static keyword, so that local variables retain their values ??between multiple function calls, but do not change their local access characteristics.
- PHP Tutorial . Backend Development 872 2025-06-29 02:16:30
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- How to run PHP on a virtual host?
- The following key points should be paid attention to when running PHP on a virtual host: 1. Upload PHP files to the correct directory, such as public_html or htdocs, and ensure that the file permissions are 644; 2. Check and select the appropriate PHP version to avoid version incompatibility issues; 3. If you use a database, you need to create a database and user in the control panel and modify the program configuration file to fill in the database information; 4. Pay attention to common problems, such as file path errors, disabled PHP functions, permission problems, and pseudo-static settings, etc., and enable error prompts if necessary to troubleshoot problems. As long as these steps are configured correctly, the PHP program will run smoothly.
- PHP Tutorial . Backend Development 566 2025-06-29 02:16:10
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- PHP development environment: from installation to the first project practice
- TostartaPHPdevelopmentenvironment,choosetoolslikeXAMPP,WAMP,orMAMPforlocalsetup.1)DownloadandinstallXAMPP,startApacheandMySQL,placePHPfilesinhtdocs.2)Setupastructuredprojectlayoutwithseparatefoldersforpublicfiles,sourcecode,views,andassets.3)Writeaba
- PHP Tutorial . Backend Development 394 2025-06-29 02:13:21
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- How do I use the and elements to group and style table columns?
- Use and can simplify table column style settings. 1. When wrapping multiple tags, you can directly apply styles such as background color and width for the entire column; 2. It must be placed in the inner header, and supports the definition of multi-column styles for the span attribute; 3. Only some CSS attributes are supported, and are not suitable for complex layouts or differentiated styles; 4. Suitable for large tables or scenarios where cell structure cannot be controlled, but attention should be paid to browser compatibility and separation of structure and styles.
- HTML Tutorial . Web Front-end 527 2025-06-29 02:11:31
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- How do I use the element to represent dates and times?
- Tags are used to semantically represent time, which is both understandable and easy for machine recognition. 1. The basic writing method is to display the time of the package and use the datetime attribute to provide the time value in ISO8601 format, such as March 15, 2025; 2. A more accurate time point can be represented by adding the time part, the format is YYYY-MM-DDTHH:MM, such as 3:15 pm on March 15; 3. pubdate was used to identify the release time, but it has been abandoned, and it is recommended to use microdata or JSON-LD instead; 4. Combined with structured data (such as Schema.org) you can realize the event reminder function, such as search engines that can identify activity time and display rich media summary. The key to mastering is to use datetime to provide standard formats
- HTML Tutorial . Web Front-end 143 2025-06-29 02:10:52
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