Found a total of 10000 related content
Understanding Frontend Bundling and Transpilation
Article Introduction：Packaging is to merge multiple files into a few files to reduce the number of requests, common tools such as Webpack and Vite; translation is to convert new version code into old versions to improve compatibility, commonly used tools such as Babel; in the construction process, they are usually first translated and then packaged, and different resources are processed through the loader mechanism; in development, they should reasonably split and package, avoid over-translation, configure Polyfill, and use efficient construction tools.
2025-07-16
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1004
Performance monitoring method of Docker under Debian system
Article Introduction：Monitoring Docker performance in Debian systems is a critical task, which helps ensure system stability and optimize resource utilization. The following are some commonly used monitoring methods and tools: Instant resource monitoring top/htop: htop is an extended version of the top function, with functions such as color marking, mouse interaction and process structure diagram. It can be obtained through aptinstallhtop. vmstat: used to view virtual memory, CPU context swap, and disk input and output. After installing the sysstat package, the vmstat command is available. iostat: used to monitor disk input and output and CPU utilization. After installing the sysstat package, you can use the iostat command. sar: long-term
2025-05-28
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313
How to connect PHP script to MySQL database
Article Introduction：In online form development, connecting PHP code with MySQL database is a common operation. User form data needs to be collected and added to the database. This article introduces two commonly used PHP and MySQL database connection methods.
PHP and MySQL database connection
To connect MySQL database to PHP, you need to install MySQL, database management tools and PHP on your computer. The two most commonly used connection methods are MySQLi and PDO.
First, we introduce the easier MySQLi to use.
First create a MySQL database, here we use TablePlus. TablePlus is a convenient database management tool that handles a variety of databases in a single interface. Through its user-friendly interface,
2025-04-11
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734
How to document a php function with PHPDoc?
Article Introduction：PHPDoc is a structured annotation that describes the uses and structure of PHP functions, classes, or methods. 1. It uses /*.../ package, including tags such as @param, @return, etc. 2. Commonly used tags include @param (parameter type and meaning), @return (return value type and meaning), @throws (possible exceptions), @deprecated (deprecated tag), @example (usage example). 3. The principles for writing clear PHPDoc include clear types, concise description, listing parameters in order, and not omitting the return value. 4. The actual functions of PHPDoc include assisting IDE smart prompts, supporting document generation tools, improving code maintainability, and helping
2025-07-22
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299
PHP's Superglobal Variables
Article Introduction：PHP has five most commonly used hyperglobal variables, namely $\_GET, $\_POST, $\_SERVER, $\_SESSION, and $\_COOKIE. ①$\_GET is used to obtain parameters in the URL, suitable for non-sensitive data transmission such as paging and filtering, but attention should be paid to input verification; ②$\_POST is used to receive sensitive data submitted by the form, such as login information, and it is necessary to prevent SQL injection and XSS attacks; ③$\_SERVER provides information about the server and script execution environment, such as the current script name, user IP and request method, and check whether the key exists before use; ④$\_SESSION is used to maintain user status across pages, and session\_st must be called first when using it.
2025-07-18
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224
How to configure PHP development environment?
Article Introduction：The key to configuring a PHP development environment is to select the toolchain, install the necessary components and ensure normal collaboration. 1. Install the PHP interpreter and commonly used extensions. It is recommended that novices use XAMPP, WAMP or MAMP one-click integration packages, or manually install and enable php-mbstring, php-curl and other extensions through brew, apt, etc.; 2. Build a local development server, and you can use the integration package with Apache, PHP built-in server (such as php-Slocalhost:8000) or Nginx PHP-FPM. It is recommended that novices use the built-in server first; 3. Configure database connections, such as using MySQL in the integration package, and test through PDO or mysqli connection; 4
2025-06-30
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313
How to perform reflection in Java?
Article Introduction：Reflection allows runtime checking and manipulating classes, methods, fields and constructors in Java. It is implemented through the java.lang.reflect package. You need to get the Class object first. 1. Use .class syntax, 2. Call the object's getClass() method, 3. Use Class.forName() to load the class dynamically; then you can get and call methods (including private methods that require setAccessible(true)), access and modify fields, and create instances (recommended getDeclaredConstructor().newInstance()); it is commonly used in frameworks such as Spring, Hibernate, serialization libraries and testing tools.
2025-08-03
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945
How to install PHP on Linux?
Article Introduction：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.
2025-06-28
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504
Optimizing Java Startup Performance
Article Introduction：Java startup performance optimization can be accelerated by reducing class loading time, adjusting JVM parameters, and using GraalVM. 1. Simplify the dependency library and reduce unnecessary jar packages; 2. Enable AppCDS to pre-package commonly used classes to speed up loading; 3. Avoid complex static initialization blocks; 4. Configure JVM parameters such as enabling hierarchical compilation and setting fixed heap memory size; 5. Consider the -client mode for short life cycle tasks; 6. Use GraalVMNativeImage to skip the JVM startup process; 7. Use JVM's own tools to monitor the time-consuming startup stages to accurately locate bottlenecks.
2025-07-16
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786
What is the composer/package-versions-deprecated package?
Article Introduction：composer/package-versions-deprecated was used to resolve dependency version conflicts in PHP projects, but is now deprecated. 1. Before Composer 2.0, this package provided a method to define version constraints at the package level, so that developers can declare compatibility rules between different packages, thereby reducing conflicts caused by different dependencies requiring different versions of the same library; 2. Since Composer 2.0, its functions have been replaced by built-in support, including platform coverage and complex version constraints; 3. At present, it still has many reasons for the project not being updated, old dependencies references or not cleaning up old tools; 4. If you use Composer 2 and above, the package can be safely removed and should be
2025-07-09
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580
PHP Multi-Line Comment Syntax
Article Introduction：PHP multi-line comments use /* and */ package content. 1. Start with /* and end with */, and can span multiple lines; 2. The comment content will not be executed, suitable for explanation logic or temporary blocking code; 3. It cannot be used in nested ways, otherwise it will lead to syntax errors; 4. It is often used in scenarios such as function descriptions, author version descriptions, etc., and documents can be generated with tools; 5. Different from single-line comments (// or #), the latter is only suitable for single-line brief descriptions. Mastering these key points makes the code more standardized and easy to maintain.
2025-07-17
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294
Strategies for MySQL Query Performance Optimization
Article Introduction：MySQL query performance optimization needs to start from the core points, including rational use of indexes, optimization of SQL statements, table structure design and partitioning strategies, and utilization of cache and monitoring tools. 1. Use indexes reasonably: Create indexes on commonly used query fields, avoid full table scanning, pay attention to the combined index order, do not add indexes in low selective fields, and avoid redundant indexes. 2. Optimize SQL queries: Avoid SELECT*, do not use functions in WHERE, reduce subquery nesting, and optimize paging query methods. 3. Table structure design and partitioning: select paradigm or anti-paradigm according to read and write scenarios, select appropriate field types, clean data regularly, and consider horizontal tables to divide tables or partition by time. 4. Utilize cache and monitoring: Use Redis cache to reduce database pressure and enable slow query
2025-07-13
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448
Dave The Diver: How To Catch Spider Crabs
Article Introduction：In Dave The Diver, there are some creatures that are not easy to catch. Or, catch alive that is. The spider crab is one of those very species, making it seem like the only way to bring these crustaceans back up to land is to viciously crack them up w
2025-01-10
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864
Prepare for Interview Like a Pro with Interview Questions CLI
Article Introduction：Prepare for Interview Like a Pro with Interview Questions CLI
What is the Interview Questions CLI?
The Interview Questions CLI is a command-line tool designed for JavaScript learners and developers who want to enhance their interview
2025-01-10
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1490
Soft Deletes in Databases: To Use or Not to Use?
Article Introduction：Soft Deletes: A Question of DesignThe topic of soft deletes, a mechanism that "flags" records as deleted instead of physically removing them, has...
2025-01-10
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1084
