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  • What is the correct order for link pseudo-classes like :link, :visited, :hover, and :active in CSS Selectors?
    What is the correct order for link pseudo-classes like :link, :visited, :hover, and :active in CSS Selectors?
    In CSS, the order of pseudo-class selectors: link, visited, :hover and :active is very important. They must be written in the order of LVHA (Link→Visited→Hover→Active), because if the styles are of the same priority, the subsequent rules will override the previous one; 1.:link sets the unvisible link style; 2.:visited sets the accessed link style, but is subject to browser privacy restrictions; 3.:hover sets the mouse hover effect, and the mobile terminal may need additional processing; 4.:active sets the style when clicking to provide instant feedback; this order ensures that all statuses can be displayed correctly to avoid browser inconsistencies.
    CSS Tutorial . Web Front-end 971 2025-06-28 00:02:21
  • How do I choose the right PHP framework for my project?
    How do I choose the right PHP framework for my project?
    Choosing the right PHP framework requires combining project requirements and team capabilities. 1. Clarify the project type: CMS choose WordPress, API or background system choose Laravel or Lumen, enterprise-level applications choose Symfony, fast development MVP choose Laravel, lightweight and flexible choice CodeIgniter or Slim, and long-term maintenance projects choose Symfony. 2. Consider team familiarity and community support: Laravel's active community is suitable for most teams, Symfony is suitable for large companies, and CodeIgniter is easy to get started. 3. Evaluate performance and scalability: choose Lumen with high concurrency, choose Laravel or Symfony with strong scalability, use a lightweight framework for small projects, that is,
    PHP Tutorial . Backend Development 1027 2025-06-27 02:16:50
  • What is the null coalesce operator (??) in PHP 7?
    What is the null coalesce operator (??) in PHP 7?
    PHP7's null merge operator (??) is used to check whether a variable or array element exists and is not null. If it exists, it returns the value, otherwise it returns the default value. 1. It simplifies the repetitive writing method that originally required isset() and ternary operators, such as $username=$_GET['name']??'guest'; 2.?? Only judge null, and return the original value to empty strings, 0 or false; 3. More "unset" scenarios can be handled by combining functions such as empty(); 4. Support chain fallback and try multiple values ??in sequence, such as $value=$_GET['key1']??$_POST['key2']??getDefault().
    PHP Tutorial . Backend Development 234 2025-06-27 02:15:41
  • What are the differences between JWT and Session-based authentication in PHP?
    What are the differences between JWT and Session-based authentication in PHP?
    Session-basedauthenticationisbetterforserver-renderedwebapps,whileJWTsuitsAPIsandSPAs.Sessionsstoredataserver-side,areeasytouseinPHP,andallowinstantrevocation,butrequiresharedstoragewhenscaling.JWTsarestateless,scalable,andworkwellacrossdomains,butla
    PHP Tutorial . Backend Development 840 2025-06-27 02:15:10
  • How to run code through PHP built-in server?
    How to run code through PHP built-in server?
    TorunPHPapplicationslocallywithoutafullwebserver,usethebuilt-inPHPserverbyfirstensuringPHPisinstalledviaphp-v1.InstallPHPifneededusingpackagemanagersorXAMPP2.PlaceyourPHPfilesinaprojectdirectoryandnavigatetoitviaterminal3.Starttheserverwithphp-Slocal
    PHP Tutorial . Backend Development 161 2025-06-27 02:14:51
  • How to upgrade PHP version?
    How to upgrade PHP version?
    Upgrading the PHP version is actually not difficult, but the key lies in the operation steps and precautions. The following are the specific methods: 1. Confirm the current PHP version and running environment, use the command line or phpinfo.php file to view; 2. Select the suitable new version and install it. It is recommended to install it with 8.2 or 8.1. Linux users use package manager, and macOS users use Homebrew; 3. Migrate configuration files and extensions, update php.ini and install necessary extensions; 4. Test whether the website is running normally, check the error log to ensure that there is no compatibility problem. Follow these steps and you can successfully complete the upgrade in most situations.
    PHP Tutorial . Backend Development 198 2025-06-27 02:14:10
  • How do I sort arrays in PHP using functions like sort(), asort(), ksort(), rsort()?
    How do I sort arrays in PHP using functions like sort(), asort(), ksort(), rsort()?
    PHPprovidesseveralfunctionsforsortingarrays.1.sort()sortsnumeric-indexedarraysinascendingorderandreindexesthem.2.rsort()doesthesamebutindescendingorder.3.asort()sortsassociativearraysbyvaluewhilepreservingkey-valueassociations.4.ksort()sortsassociati
    PHP Tutorial . Backend Development 303 2025-06-27 02:10:30
  • PHP beginner guide: Detailed explanation of local environment configuration
    PHP beginner guide: Detailed explanation of local environment configuration
    To set up a PHP development environment, you need to select the appropriate tools and install the configuration correctly. ①The most basic PHP local environment requires three components: the web server (Apache or Nginx), the PHP itself and the database (such as MySQL/MariaDB); ② It is recommended that beginners use integration packages such as XAMPP or MAMP, which simplify the installation process. XAMPP is suitable for Windows and macOS. After installation, the project files are placed in the htdocs directory and accessed through localhost; ③MAMP is suitable for Mac users and supports convenient switching of PHP versions, but the free version has limited functions; ④ Advanced users can manually install them by Homebrew, in macOS/Linux systems
    PHP Tutorial . Backend Development 988 2025-06-27 02:09:01
  • How to run PHP files on Windows?
    How to run PHP files on Windows?
    There are three ways to run PHP files on Windows. First, download the Windows version of PHP and configure environment variables: download the non-thread-safe version from php.net, decompress it to a fixed path (such as C:\php), add it to the system PATH, enter php-v on the command line to display the version number, and then install it successfully. Then use phptest.php to run the file. Second, use an integrated development environment such as XAMPP or WAMP: Download XAMPP and select the Apache PHP component installation, after starting Apache, put the PHP file in the http://localhost/yourfile.php through the browser to run.
    PHP Tutorial . Backend Development 285 2025-06-27 02:08:21
  • How to run PHP files using XAMPP?
    How to run PHP files using XAMPP?
    TorunPHPfileswithXAMPP,placetheminthehtdocsdirectoryandaccessvialocalhost.1.InstallandstartApachefromXAMPPcontrolpanel.2.Placeyour.phpfileinsidehtdocs(e.g.,C:\xampp\htdocs\your-folder-name\your-file.php).3.Accessitviabrowserathttp://localhost/your-fo
    PHP Tutorial . Backend Development 493 2025-06-27 02:07:02
  • What are Weak Maps in PHP?
    What are Weak Maps in PHP?
    PHP does not have a built-in WeakMap type, but similar functions can be implemented through the WeakMap class provided by the WeakrefPECL extension. The key feature of WeakMap is that its keys are stored in a weak reference manner, avoiding preventing garbage collection and thus preventing memory leaks. When using it, you must first install and enable the Weakref extension. After creating a WeakMap instance, the object is stored as a key, and it will be automatically cleaned when there are no other references to the object. Applicable scenarios include: 1. Cache object-related data; 2. Add metadata to the object; 3. Avoid memory leaks in the event system. Notes include: 1. WeakMap is not a PHP core function; 2. The key must be an object; 3. The entry clearing time is uncontrollable. If the deployment environment allows,
    PHP Tutorial . Backend Development 354 2025-06-27 02:05:51
  • How do I output text to the browser using PHP (echo, print)?
    How do I output text to the browser using PHP (echo, print)?
    TooutputtexttoabrowserinPHP,youcanuseechoorprint,withechobeinggenerallypreferredforperformanceandflexibility.echoallowsmultiplestringsseparatedbycommas,doesn’treturnavalue,andisfaster,whileprintreturns1andacceptsonlyoneargument,makingitsuitableforcon
    PHP Tutorial . Backend Development 842 2025-06-27 02:03:40
  • Steps to deploy a PHP environment on a cloud server
    Steps to deploy a PHP environment on a cloud server
    The steps to deploy a PHP environment to a cloud server include: 1. Select the appropriate cloud service provider and server configuration; 2. Install PHP and commonly used extensions; 3. Configure the web server and site directory; 4. Set up the database and test the connection. First, you should choose a service provider with one-click mirror installation function. It is recommended to configure it at least 1 core 2G memory and 20GB system disk; secondly, use apt on Ubuntu to install PHP and necessary extensions, and verify whether the installation is successful; then put the project into the default website root directory and set permissions, or configure the virtual host as needed; finally install MySQL or MariaDB, create a database and user, and test whether the environment is running normally through the phpinfo() page. Pay attention to permissions and service retention in the whole process.
    PHP Tutorial . Backend Development 1020 2025-06-27 02:03:20
  • How to select elements using their html attributes in CSS selectors?
    How to select elements using their html attributes in CSS selectors?
    The methods for selecting CSS attribute selector include: 1. The basic attribute selector input[type="text"] is used to fully match the attribute value; 2. The attribute existence judgment is as long as the attribute existence is img[alt] is used to exist; 3. Partial matching is such as [class~="btn"] to match independent words, [href^="/user"] to match the beginning string, [name*="user"] to match the substring, [src$=".jpg"] to match the ending string; 4. Multi-attribute combinations such as buttontype="subm
    HTML Tutorial . Web Front-end 418 2025-06-27 01:59:31

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