0 views collected around this technical thread.
This article walks through designing and implementing a Java rule engine that supports both AND and OR logical relationships, showing the core rule abstractions, concrete rule examples, the builder pattern for composing rules, and a discussion of its advantages and drawbacks.
This article explains PHP’s array_flip() function, detailing its syntax, behavior with duplicate values, and practical usage through examples that demonstrate swapping array keys and values, locating keys by value, and improving code efficiency in backend development.
This article explains how the PHP file() function reads a file’s contents into an array, describes its parameters, demonstrates basic usage and advanced options such as ignoring newline characters, and provides complete code examples for practical implementation.
This article explains the Aho‑Corasick automaton, a classic multi‑pattern matching algorithm that builds a Trie with fail pointers to achieve linear‑time search over massive keyword sets, and demonstrates a Java implementation for highlighting keywords in HTML documents.
This article explains PHP’s built‑in dirname() function, detailing its purpose, syntax, parameters, return values, and provides multiple code examples demonstrating how to extract directory paths from absolute, relative, and Windows file paths, including handling of edge cases.
This article explains PHP’s array_udiff() function, detailing its purpose of comparing arrays, the required parameters and callback, provides the function syntax, discusses performance considerations, and demonstrates a practical example that highlights how to retrieve differing elements between two arrays.
This article introduces Java 8 Stream API, explains its core operations such as filter, map, sorted, forEach, collect, statistics, and parallelStream, and demonstrates their usage with a UserPo class through comprehensive code examples, while also noting unrelated promotional offers.
This article explains PHP's array_replace_recursive() function, detailing its syntax, recursive merging behavior, example code, output interpretation, and important usage notes, while comparing it with array_merge_recursive for handling array key conflicts in PHP development.
This article explains the fundamentals of recursion in Java, covering its definition, advantages and disadvantages, differences from iteration, and provides practical examples such as traversing comment and department trees, along with code snippets, performance considerations, and improvement strategies using depth control and Stream API.
This article explains PHP's is_callable() function, shows how it checks whether functions or methods are callable with one or two arguments, and provides clear code examples demonstrating its use with a simple function and a class method to improve code robustness.
MoonBit is an AI‑native, general‑purpose programming language that blends Rust and Scala concepts, offering garbage collection, WebAssembly compilation, rich type system, pattern matching, traits, operator overloading, testing support, and functional programming features, illustrated through a chess‑board modeling example.
This article explains PHP's ceil() function, shows its syntax, and provides three code examples demonstrating how to round floating‑point numbers and integers upward, including the resulting outputs and a brief discussion of each case.
This article explains how PHP's array_filter() function works, details its parameters, and provides clear code examples for filtering even numbers and removing empty values from associative arrays, helping developers apply flexible array filtering in real-world backend projects.
This article explains the PHP is_numeric() function, shows how it checks whether a variable (including integers, floats, or numeric strings) is numeric, provides code examples for direct usage and form validation, and notes special cases to watch out for.
This article introduces a unified log recording solution for Java backend services, covering the background need, expected UI effects, database schema, core principles, detailed annotation and service implementations, and multiple usage scenarios including simple log objects, inheritance, and nested objects.
This article explains how the PHP is_bool() function determines whether a variable holds a boolean value, provides a complete code example with four different variables, shows the resulting output, and discusses why only true and false are recognized as booleans.
This guide explains Python file I/O fundamentals, covering encoding, opening files with different modes, reading methods (read, readline, readlines), writing and flushing data, automatic closing with context managers, and practical examples such as word counting, all illustrated with clear code snippets.
This article explains the purpose, syntax, parameters, and return value of PHP's dirname() function and demonstrates its usage through four detailed code examples covering absolute, relative, and Windows paths as well as edge cases.
This article explains Python's magic (dunder) methods, detailing their purpose, common special methods for initialization, comparison, arithmetic, container protocols, and other operations, and provides a practical code example to illustrate how they enable custom class behavior.
This article introduces the devkeep/tools PHP package, explains how to install it, lists its extensive utility functions for data handling, and provides concrete code examples demonstrating tasks such as array sorting, tree classification, Excel export, QR code generation, and email sending.