The nginx 1.19.4 mainline release adds new directives such as proxy_smtp_auth, several ssl_conf_command variants, and ssl_reject_handshake, with the latter allowing servers to reject SSL handshakes for specified hostnames, as demonstrated by example configuration snippets.
This article explains PHP's array_intersect_key() function, detailing its purpose of intersecting arrays based on key names, describing each parameter, return value, and providing a complete example with code and expected output for developers.
This article presents a structured approach to mastering microservices, covering the learning pyramid concept, a detailed learning path with resource collection, and an overview of the six essential components—service description, registry, framework, monitoring, tracing, and governance—along with practical tips and visual diagrams.
This article presents a Java interview preparation guide featuring a unit‑conversion sorting problem with complete code, two additional coding challenges, and a collection of typical interview questions on design patterns, GC troubleshooting, MySQL optimization, and Zookeeper election, plus links to extensive interview question archives.
Laravel-Quick is an open‑source Laravel package that provides translated validation messages, standardized HTTP status responses, exception handling, Redis‑based cache helpers, and artisan generators, with installation and usage instructions for backend developers.
This guide explains how to upgrade the Laravel installer to the latest version using Composer, covering three methods: composer require, uninstall and reinstall, and editing the global composer.json, with commands and verification steps.
This tutorial explains how to integrate QQ third‑party login into a PHP website by obtaining QQ Connect credentials, downloading and configuring the SDK, adding the necessary OAuth code, creating a login button, and handling the callback to retrieve user information.
Elasticsearch calculates a relevance score for each document, but using the function_score query you can customize this scoring by combining the original query_score with a user-defined func_score through various functions such as weight, random_score, field_value_factor, decay_function, and script_score, allowing flexible ranking based on business needs.
This article explains how to configure Maven profiles for different environments, use the maven‑assembly‑plugin to create a zip deployment package, and employ a custom shell script (shenniu_publish.sh) to unzip, start, stop, and restart a Spring Boot jar on Linux, streamlining the build‑and‑deploy workflow.
This article uses Taobao's backend as a case study to illustrate how a system evolves from a single‑machine deployment to a multi‑layer, highly available, cloud‑native architecture capable of handling millions of concurrent users, covering concepts such as distribution, load balancing, caching, database sharding, micro‑services, containerization, and cloud platforms.
This article explains the concept of ThinkPHP Hook behaviors, demonstrates how to define, bind, and trigger custom behavior classes with code examples, and shows how to decouple login logic using event‑like hooks for more maintainable backend development.
This guide demonstrates how to set up a Redis multi-database singleton wrapper in a ThinkPHP project, covering prerequisite installation, configuration of connection parameters, creation of a custom Redis class with static instance management, and example usage of Redis commands across different databases.
The article explains the distinctions between the view() helper and the fetch() method in ThinkPHP5 controllers, showing code examples for both inherited and non‑inherited controllers, discussing how they handle common template configurations, and recommending the preferred usage in projects.
This article explains the cache breakdown problem, introduces Laravel 7's built‑in RedisLock class, details its constructor parameters, and provides a complete code example demonstrating how to acquire and release a Redis lock to safely populate and update cached data.
The NGINX 1.19.4 mainline release adds new SSL directives such as ssl_conf_command and ssl_reject_handshake, introduces a proxy_smtp_auth mail proxy feature, and provides configuration examples showing how to reject SSL handshakes for all server names except a specified one.
This article explains how the PHP function array_flip works, its parameter requirements, return values, edge cases such as duplicate values, and provides clear code examples demonstrating how to swap keys and values in an associative array.
The article analyzes flash‑sale (秒杀) business characteristics, outlines the technical challenges of massive concurrent requests, and presents architectural principles, backend design, database strategies, concurrency control, anti‑cheat measures, and practical code examples to build a reliable high‑throughput system.
This article introduces the open‑source "netease‑cloud‑music‑community" project, outlines its key features such as login, posting, commenting, and likes, details the Java SpringBoot and uni‑app technology stacks, and provides step‑by‑step instructions for setting up both the backend and frontend environments.
This article explains PHP's array_filter function, describing its parameters, return value, and how it applies a user‑defined callback to each array element, with detailed code examples that demonstrate filtering for odd, even, and truthy values.
This tutorial explains Laravel's powerful Collection class, demonstrating how to create collections with the collect helper and use methods such as filter, search, chunk, map, zip, whereNotIn, max, pluck, each, tap, pipe, contains, forget, and avg to manipulate data without additional database queries.
This article explains Elasticsearch's foundation on Lucene, compares its concepts to MySQL, describes inverted indexing, and provides a step‑by‑step guide for installing, configuring, and using the basemkhirat/elasticsearch Laravel plugin with code examples and tips for Chinese analysis.
This guide explains how to install and configure the Hyperf log‑viewer component, publish its configuration, register a route, add view and template engine support, and adjust view and log settings to enable file log browsing and simple search within a PHP backend application.
This article explains how Composer, the PHP dependency manager, supports four autoloading mechanisms—PSR‑0, PSR‑4, class‑map, and files—detailing their differences, configuration in composer.json, and practical code examples for loading classes.
This article demonstrates how to build a basic Tornado server, measures its performance under blocking operations, and then progressively applies multithreading, thread‑pool executors, and finally asyncio to achieve dramatically higher QPS and lower response times.
This article introduces seven open‑source projects that demonstrate frontend‑backend separation using technologies such as Vue, Angular, React, SpringBoot, and SpringCloud, providing practical examples and resources for developers to deepen their full‑stack development skills.
This article explains PHP's array_fill() function, detailing its syntax, parameters, return value, and providing example code that demonstrates how to create arrays filled with a specified value, including handling of start indexes and negative indices.
The author recounts a three‑year journey of scaling a Python‑based HR SaaS backend from a simple Django MVC prototype to a microservice architecture with domain‑driven design, detailing each architectural stage, the challenges faced, and the concrete optimizations applied.
This article introduces eight widely used Python web scraping tools—Scrapy, PySpider, Crawley, Portia, Newspaper, Beautiful Soup, Grab, and Cola—detailing their main features, typical use cases, and project links, helping developers choose the appropriate framework for data extraction tasks.
This article shares a developer's job‑search journey and detailed interview recap, covering project experience, Java collections, HashMap vs Hashtable, synchronized and volatile, singleton patterns, thread‑pool types, Spring Boot AOP, and Redis caching concepts, illustrated with diagrams.
This article explains the PHP function array_fill_keys(), describing its purpose, parameters, return value, and provides a complete example with code and output to demonstrate how to create an array by assigning a common value to a set of specified keys.
This article describes the architecture of JD.com’s JDDLB public‑traffic load balancer and details how offloading CPU‑intensive SSL/TLS cryptographic operations to Freescale C291 acceleration cards—via custom NGINX modules, OpenSSL Engine integration, and synchronous/asynchronous driver interfaces—significantly improves connection‑establishment rates and overall throughput.
Exception testing, a distinct testing type from functional and performance testing, helps uncover system issues caused by system, dependency, or application anomalies, enabling designers to improve solutions and enhance overall system stability through comprehensive test case design and execution.
The author recounts a four‑stage evolution of a Python‑based SaaS backend—from a simple Django MVC prototype through service splitting, microservice adoption with Kong and custom RPC, to an exploratory domain‑driven design—highlighting practical problems, optimizations, and architectural trade‑offs.
This tutorial introduces Go's fundamental operators—including arithmetic, relational, logical, bitwise, and assignment types—and explains the language's control flow constructs such as if, switch, for loops, and goto, complete with clear code examples for each concept.
This article explains the essence of software architecture, outlines its various classifications—including business, application, technical, code, and deployment architectures—describes when architecture design is needed, and presents metrics and common pitfalls for evaluating a sound, scalable system.
This article explains the PHP array_diff() function, describing its purpose, parameters, return value, and provides a complete example with code that demonstrates how it returns the elements present in the first array but absent from subsequent arrays.
This guide explains how to add Tomcat support to IntelliJ IDEA Community Edition by installing a compatible plugin, configuring the server and web project, handling download issues, and deploying your web application without needing the paid Ultimate edition.
This article explains the HttpServletResponse object's role in Java web development, details common response header methods, highlights differences between addXXX and setXXX, and provides four complete servlet code examples covering cache control, page refresh, file download (including Chinese filenames), and dynamic image generation.
This article analyzes the internal workflow of Java's ThreadPoolExecutor, focusing on how worker threads are reclaimed under both normal RUNNING conditions and after shutdown, detailing the runWorker loop, getTask() null returns, and the role of CAS and interrupt handling.
This article explains the concept of idempotency, common causes of duplicate submissions, and presents several practical solutions—including PRG, token validation, local locks using ConcurrentHashMap, and distributed locks with Redis—accompanied by Spring Boot AOP annotations and full code examples.
The article explains how PHP's array_diff_uassoc() function compares arrays using both values and user‑defined key comparison callbacks, describes its parameters and return value, and provides a complete example with code and expected output.
This article provides an in‑depth analysis of Tomcat’s architecture, covering its core components such as connectors, containers, lifecycle management, class‑loader hierarchy, and design patterns like composite, observer, and template method, while offering practical guidance for reading source code and applying these concepts in real projects.
This article explains the motivation behind circuit breakers, illustrates how cascading failures occur in distributed microservices, describes the three circuit breaker states (closed, open, half‑open), and provides Python and Envoy configuration examples to implement fault‑tolerant service communication.
This article explains how the PHP function array_diff_key() compares arrays by their keys, describes its parameters and return value, and provides a complete example with code and output showing how to obtain the key‑based difference between two associative arrays.
This article explains the PHP function array_diff_assoc(), detailing its purpose of returning elements from the first array that are absent in subsequent arrays while comparing both keys and values, outlines its parameters and return value, and provides a complete code example with expected output.
The PHPConChina 2020 conference highlighted the challenges of TCP/IP, introduced QUIC and HTTP/3 as solutions for faster, more secure web communication, explored PHP's role in micro‑service architectures with ServiceMesh, and presented Swow's innovative features that empower PHP developers to build high‑performance network applications.
This article outlines the evolution of project architecture from single‑server MVC to RPC, SOA, and micro‑services, and provides clear explanations of core distributed‑system terms such as clusters, load balancing, caching, and flow control for developers.
This article explains how the PHP function array_count_values() works, describes its single array parameter, return format, warning behavior for non‑string/integer elements, and provides a complete code example with expected output.
This article presents a comprehensive design for WeChat Mini Program login and authorization, detailing business scenarios, silent‑login flow with token management, fault‑tolerant session handling, step‑wise UI components for user and phone permissions, and a clear front‑end/back‑end API contract within a layered architecture.
This article introduces RocketMQ’s core concepts, including its deployment architecture, naming server, broker and client roles, subscription model, consumption modes, queue allocation algorithms, rebalancing, offset storage, transaction and delayed messages, as well as filtering mechanisms, providing a solid foundation for further practice.
This guide explains how PHP's array_combine() function builds an associative array by pairing one array of keys with another array of values, details its parameters, return behavior, warning conditions, and provides a clear code example with expected output.
This guide walks through analyzing a Tenda router's web interface to discover its data‑fetching URLs, extracting all available modules, and then using Python's requests library to retrieve the information and expose it through a simple Flask API, with both object‑oriented and functional code examples.
This article explains why API version control is essential for software iteration, outlines major and minor version strategies, compares URI, host, and header versioning methods, and demonstrates routing techniques—including Nginx configuration—to support parallel API versions.
This article provides a comprehensive, step‑by‑step guide to using programmatic transactions in Spring, covering both PlatformTransactionManager and TransactionTemplate approaches, complete with Maven configuration, SQL setup, test code, and best‑practice usage patterns.
This article explains the PHP array_column() function, its parameters and return value, and provides a complete example showing how to extract the "first_name" column from a record set and display the resulting array of names.
This article explains the fundamental distinctions between GET and POST HTTP methods, covering how parameters are transmitted, browser and server constraints, underlying TCP behavior, and why POST often requires two TCP packets while GET typically uses only one.
This article explains PHP’s array_chunk function, describing its parameters, return value, and optional key preservation, and provides clear example code that demonstrates how an input array can be divided into equally sized sub‑arrays.
array_change_key_case() is a PHP function that transforms all string keys in an input array to either lower‑case or upper‑case based on the specified case constant, leaving numeric indexes unchanged, and returns the modified array or FALSE if the input is not an array.
This article explains PHP's binary‑safe strcmp() function, detailing its case‑sensitive behavior, parameter meanings, return values, and provides a complete example demonstrating how to compare two strings and handle the result in code.
This article explains why SpringBoot fails to initialize components after extracting common modules due to mismatched package names, demonstrates how to use @ComponentScan and custom @Enable annotations to specify scan paths, and outlines the basics of creating a custom starter for automated configuration.
This article explains the PHP strrev() function, detailing its syntax, parameter description, return value, and provides a clear example that demonstrates how to reverse a string such as "Hello world!" using this built‑in function.
This article uses a whimsical group‑chat metaphor to compare four popular message‑queue systems—RabbitMQ, Kafka, RocketMQ and ActiveMQ—explaining their origins, latency, throughput, UI differences, and typical use‑cases such as throttling, decoupling and asynchronous processing.
The article details a real‑world investigation of a Java HTTP service that experienced a sudden QPS increase and response‑time spikes, tracing the issue through database queries, local method latency, CPU load, frequent ParNew GCs, and large response payloads, and presents concrete remediation steps.
This article explains the PHP wordwrap() function, its parameters (string, width, break, cut), return value, and provides two practical examples demonstrating how to break long strings into lines with custom delimiters and optional word cutting.
This guide surveys over a hundred modern frameworks and tools across fourteen critical backend domains—message queues, caching, sharding, data sync, communication, micro‑services, distributed utilities, monitoring, scheduling, entry proxies, storage, CI/CD, debugging, and local utilities—offering concise recommendations and practical insights for architects and engineers.
This article explains six key patterns for customizing Spring Boot auto‑configuration, covering how to locate auto‑configuration classes, the role of @Conditionalxxx, @EnableConfigurationProperties, @Import, @AutoConfigurexxx annotations, and the significance of internal static configuration classes, with concrete code examples.
This article explains the concepts of cache penetration, cache breakdown, and cache avalanche in Redis, and provides practical mitigation strategies including null caching, distributed locks, random expiration times, and the use of Bloom filters to reduce database load.
This article surveys the most influential web development technologies for 2020, covering emerging standards such as WebAssembly, progressive web apps, AI integration, blockchain, and leading frameworks like PHP, Symfony, Express.js, Django, and Angular, while highlighting market statistics, use cases, and future growth prospects.
This article explains the need for high‑performance scheduling in Java, introduces the hashed timing wheel algorithm, and details Dubbo's implementation—including core interfaces, data structures, worker logic, and practical use cases such as retries and heartbeat handling.
vivo built a high‑availability RabbitMQ middleware platform that combines an MQ‑Portal for request‑driven provisioning, an SDK that adds application‑level authentication, automatic cluster discovery, rate‑limiting, reset and blockage‑transfer capabilities, and a stateless MQ‑NameServer for name resolution and health‑based failover, enabling ten‑fold traffic growth without incidents.
The article explains how Kafka implements a hierarchical time‑wheel—a ring of bucket sets with a map for O(1) insertion, removal and expiration—to replace costly per‑tick scans, enabling efficient management of millions of delayed tasks across multiple timeout layers.
This article explains how to design and implement elegant RESTful APIs using ThinkJS, covering routing conventions, controller generation, custom router configuration, CRUD action mapping, token‑based authentication, permission validation with Logic layers, inheritance for reusable checks, and database operations with chainable queries.
This comprehensive guide explains the essence of software architecture, clarifies related concepts such as systems, modules, and frameworks, and details various architectural layers, classifications, evolution paths, and best‑practice considerations for building robust, scalable systems.
The article explains four XML parsing approaches (DOM, SAX, JDOM, DOM4J), highlights the use of Groovy for scripting, provides a sample XML snippet, and presents a complete Groovy/Java utility class that leverages dom4j to parse XML files for backend applications.
The article explains PHP’s mb_strstr() function, detailing its syntax, how it finds the first occurrence of a needle in a haystack, the optional before_needle and encoding parameters, and the return values including FALSE when the needle is absent.
This article explains the functional differences between Java Stream's map() and flatMap() methods, demonstrates their behavior with simple and nested list examples, and clarifies how each transforms or flattens data in Java 8 streams.
The article explains PHP's mb_strpos function, detailing its multibyte‑safe search for a substring, the parameters haystack, needle, offset, and encoding, and the return value indicating the first occurrence position or FALSE if not found.
This article explains the motivations for adopting Spring Cloud, defines its components and design goals, compares it with Spring Boot and other frameworks, outlines its main sub‑projects, versioning scheme, and provides practical guidance on configuration, service discovery, load balancing, fault tolerance, and gateway development for cloud‑native microservices.
This article introduces PHP as a server‑side scripting language, outlines its history and licensing, and details the PHP 8 release roadmap, including the recent RC 1 launch, upcoming RC 2, the final GA date, and key new features such as JIT, Union Types, Attributes, and WeakMap.
This article presents a curated list of 29 Alibaba open‑source projects—including Spring Cloud Alibaba, Ant Design, Druid, Fastjson, Dubbo, JStorm, Nacos, Sentinel, and many more—detailing their core purpose, key features, and GitHub repositories for developers seeking robust solutions across cloud, micro‑services, frontend, and data processing domains.
This article outlines the step‑by‑step evolution of a high‑traffic e‑commerce backend—from a single‑machine setup through caching, load balancing, database sharding, microservices, containerization, and finally cloud deployment—while summarizing the key technologies and design principles at each stage.
This article introduces Spring as a lightweight IoC and AOP container, explains Spring MVC as its web framework, describes Spring Boot's convention‑over‑configuration approach to simplify setup, and outlines how Spring Cloud builds on Spring Boot to provide micro‑service governance.
This article explains the role of Servlet Filters in Spring Boot, details their execution chain, shows how to implement custom filters, and provides step‑by‑step configurations using FilterRegistrationBean and @WebFilter, including a practical CORS filter example.
This article provides a comprehensive explanation of Java's HashMap and ConcurrentHashMap implementations, covering their internal data structures, hashing mechanisms, load factor, resizing process, collision handling, and the differences between JDK 1.7 and 1.8, along with practical interview questions and code examples.
This page provides a comprehensive collection of links to over a hundred interview‑focused articles covering Java, Spring, Redis, MySQL, concurrency, design patterns, and other backend development topics, organized by issue number for easy reference.
The article uses a simple bank workflow with ten staff members to illustrate the differences in throughput between BIO (blocking I/O), NIO (non‑blocking I/O), and asynchronous processing, showing how task decomposition and specialized threads dramatically improve performance in backend systems.
Before defaulting to a microservices architecture, developers should evaluate whether their application is large enough, truly needs component scaling, can handle cross-service transactions, and can tolerate increased latency and complexity, as these factors determine if microservices will add value or unnecessary overhead.
This article explains why value objects are essential in Domain‑Driven Design, outlines their defining characteristics, shows practical modeling examples, compares different implementation forms, and demonstrates how they can simplify database design while highlighting their advantages and pitfalls.
This article explains the three major cache issues—penetration, breakdown, and avalanche—describes why they occur in high‑traffic systems, and presents four practical mitigation strategies including Bloom filters, short‑lived empty caches, distributed mutex locks with Redis or Memcache, and resource isolation with Hystrix.
This article explores the fundamentals of monolithic and microservice architectures, assesses the benefits, costs, and risks of adopting microservices, and provides practical criteria—including business complexity, team size, and technical readiness—to help decide the optimal moment for migration.
The article explains PHP's mb_substr_count function, detailing its syntax, parameters, return value, and provides a practical example showing how to count the number of times a substring appears within a multibyte string.
This article explains the core ideas of Java reflection, demonstrates how to obtain Class objects, create instances, access fields and methods, and discusses common use cases such as Spring IoC, factory patterns, and JDBC driver loading, while also covering its advantages, drawbacks, and best‑practice tips.
This article walks through a real‑world Spring Boot backend issue where a UEditor plugin required JSONP cross‑origin handling, detailing the initial CORS problem, version‑specific limitations, code adjustments using JSONPObject, and path‑reading fixes for jar‑deployed applications.
This article explains the PHP mb_substr() function, detailing its multibyte‑safe substring behavior, parameter list (str, start, length, encoding), return value, and provides a clear example showing how to extract the first two characters from a Chinese string.
This article details JD Daojia's order system architecture, tracing its evolution from a monolithic design to a micro‑service, multi‑cluster setup with Redis, MySQL, and Elasticsearch, and explains the high‑availability, disaster‑recovery, capacity‑planning, and alerting techniques that keep billions of orders running smoothly.
This article explains how to seamlessly replace Spring Boot's default Logback logging framework with alternatives like Log4j2 by leveraging the SLF4J facade, covering version requirements, dependency management, configuration files, and detailed XML examples for various log levels.
This article explains how aggregated QR payment codes unify WeChat and Alipay transactions by detecting the client via User-Agent, using JSAPI instead of Native payments, and outlines static, dynamic, and UnionPay QR workflows with practical code examples.
The article compares PHP and .NET, highlighting their performance, rapid development cycles, strong community support, rich libraries, security features, and cross‑platform capabilities, explaining why they are the preferred backend stacks for businesses building modern web applications.
This article explains what cache avalanche, cache breakdown, and cache penetration are, why they threaten database stability, and presents practical solutions such as mutex locking, pre‑warming, double‑cache, timed updates, empty‑value caching, Bloom filters, as well as common cache patterns like Cache‑Aside, Read/Write‑Through, and Write‑Behind.
This article explains how to automatically renew JWT tokens in a front‑end/back‑end separated system by storing tokens in a cache, checking them in a filter, and refreshing them when expired, thereby preventing frequent logins and preserving form data.
