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- How to use environment variables in PHP?
- There are three main ways to use environment variables in PHP: through server configuration, .env file or operating system settings, and then read in the code. First, use $_SERVER['VAR_NAME'] or getenv('VAR_NAME') to get variables, but pay attention to whether the variable is passed correctly; second, create a .env file in the root directory of the project and manually parse and load it, which is suitable for development environment; third, configure environment variables in Apache or Nginx, such as Apache uses the SetEnv directive, and Nginx uses the fastcgi_param parameter to pass variables. This method is more stable and suitable for production environments.
- PHP Tutorial . Backend Development 979 2025-06-28 02:00:33
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- How do I handle database errors in PHP?
- To handle PHP database errors, use PDO or MySQLi's try-catch mechanism 1. Set PDO's ERRMODE to an exception and catch 2. Enable MySQLi's strict mode and catch mysqli_sql_exception 3. Disable error display in production environment and log to log files 4. Show users a friendly prompt instead of the original error message 5. Clearly handle connection failures to avoid the program's execution. These methods ensure that errors are captured in a timely manner, recorded securely, and improve application robustness.
- PHP Tutorial . Backend Development 725 2025-06-28 01:59:51
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- How to install PHP on Linux?
- The steps to install PHP on Linux are as follows: 1. Confirm the system environment and PHP version requirements, and use php-v to check the current version; 2. Use package manager to install, use apt with Ubuntu/Debian, use yum or dnf with CentOS/Fedora; 3. Install commonly used extension modules such as php-curl, php-mysql, php-gd, php-mbstring, php-xml, and restart the web service to take effect; 4. Advanced users can choose source code compilation and installation, and they need to download source code packages, decompress, configure, compile and install. Follow the above method to complete the installation and configuration of PHP.
- PHP Tutorial . Backend Development 497 2025-06-28 01:58:31
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- How do I access object properties and methods in PHP?
- To access object properties and methods in PHP, use the -> operator. If the properties or methods are private, they need to be obtained through public methods. The details are as follows: 1. After creating the object, use $object->property or $object->method() to access public properties and methods; 2. Private or protected members need to be accessed indirectly through public methods such as getter/setter; 3. Static properties and methods are directly accessed through class name::. Mastering these rules can effectively avoid misuse of operators and implement encapsulation and control of data.
- PHP Tutorial . Backend Development 276 2025-06-28 01:56:31
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- How do I connect to a database using PHP (MySQLi, PDO)?
- To connect to a database, there are two ways to PHP: MySQLi and PDO. 1.MySQLi is simple and direct, suitable for projects that only use MySQL, supports process-oriented and object-oriented writing, and it is recommended to use object methods to obtain a clearer structure; 2.PDO is more flexible and supports multiple databases, suitable for projects that may migrate databases or require unified interfaces, has preprocessing statements to prevent SQL injection, and provides a unified error handling mechanism. Choosing MySQLi allows for a cleaner API and slightly higher performance, while choosing PDO allows for improved scalability and security. Both need to pay attention to correct configuration, error handling and connection closure.
- PHP Tutorial . Backend Development 182 2025-06-28 01:47:51
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- How to set up a local PHP server?
- TosetupalocalPHPserver,useXAMPPandfollowthesesteps:1)InstallXAMPP(selectApacheandPHPduringsetup),2)PlacePHPfilesinthehtdocsdirectory(e.g.,C:\xampp\htdocs\),3)Usecleanfolderstructuresforeasiernavigation,4)Testwithaphpinfo()scripttoconfirmfunctionality
- PHP Tutorial . Backend Development 146 2025-06-28 01:19:01
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- How to debug PHP code?
- The key to debugging PHP code is to enable error prompts, use variable output tools, record logs, and use professional debugging tools. First, enable error display at the beginning of the code or modify the php.ini configuration to obtain detailed error reporting information; second, use var_dump and print_r to assist in viewing variable content, and combine it with labels to improve readability; then, write debug information to the log file through error_log or file_put_contents, which is suitable for AJAX or command line scenarios; finally, introduce Xdebug extension and cooperate with IDEs such as PHPStorm to implement breakpoint debugging and performance analysis, or use LaravelTelescope/SymfonyProfile
- PHP Tutorial . Backend Development 1031 2025-06-28 01:14:11
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- How to run PHP without installing a server?
- Yes,youcanrunPHPwithoutinstallingafullwebserverlikeApacheorNginxbyusing1.PHP’sbuilt-indevelopmentserver,2.onlinePHPeditors,or3.portablePHPenvironments;eachmethodissuitablefortesting,learning,orlightweightlocaldevelopment.TousePHP’sbuilt-inserver,ensu
- PHP Tutorial . Backend Development 944 2025-06-28 01:08:41
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- How to preview the effect of PHP code in real time?
- To achieve real-time preview of PHP code effects, you need to build a local development environment and use it with tools. 1. Use XAMPP, WAMP or MAMP to build a local server, place the PHP file in the specified directory and access it through localhost, and refresh the page after modification to view the results; 2. Use VSCode's LiveServer plug-in or PHPStorm to save and refresh the browser automatically; 3. Use var_dump() or print_r() to debug output variable information in combination with browser developer tools to assist in troubleshooting problems. Although these methods are not completely real-time, they can quickly feedback the results and improve development efficiency.
- PHP Tutorial . Backend Development 869 2025-06-28 00:51:21
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- How do I use prepared statements to prevent SQL injection attacks?
- UsingpreparedstatementsisthemosteffectivewaytopreventSQLinjectionattacks.1.TheyworkbyseparatingSQLlogicfromdata,ensuringuserinputisalwaystreatedasdata,notexecutablecode.2.Thismethodusesplaceholders(like?or:username)andbindsactualvalueslater,preventin
- PHP Tutorial . Backend Development 663 2025-06-28 00:40:41
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- How to run PHP files with Nginx?
- To run PHP files, you need to install Nginx and PHP-FPM and configure FastCGI forwarding. 1. Install nginx, php, and php-fpm; 2. Edit Nginx site configuration files, set location block processing .php files and specify fastcgi_pass; 3. Enable configuration, test and restart Nginx; 4. Create phpinfo page to verify whether it is successful; 5. Pay attention to permissions, version differences and log troubleshooting problems.
- PHP Tutorial . Backend Development 296 2025-06-28 00:18:10
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- 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 1028 2025-06-27 02:16:50
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- 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 237 2025-06-27 02:15:41
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- 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 845 2025-06-27 02:15:10
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