Found a total of 10000 related content
JavaScript Prototype-Based Object Creation Patterns
Article Introduction：JavaScript object creation method is based on prototype rather than class. Constructor Prototype combination mode defines instance properties through constructors and defines shared methods for prototypes, such as functionPerson(name){this.name=name;}Person.prototype.sayHello=function(){console.log("Hello,I'm" this.name);};constp1=newPerson("Alice");p1.sayHello(); Factory function mode encapsulates the logic of the return object, such as fu
2025-07-23
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598
JavaScript Design Patterns for Maintainable Code
Article Introduction：The module mode encapsulates private state through closures, uses IIFE to create independent scopes and exposes limited interfaces, effectively avoiding global pollution and improving testability; 2. The factory mode concentrates object creation logic, returns different types of object instances according to parameters, reducing the client's dependence on specific classes; 3. The observer mode establishes a one-to-many event notification mechanism to decouple publishers and subscribers, and is suitable for event-driven systems; 4. The singleton mode ensures that there is only one instance of a class and provides global access points, which are often used in loggers, configuration management and other scenarios; 5. The decorator mode dynamically adds functions on the basis of not modifying the original object, supports separation of concerns, and can be used for cross-cutting logic such as performance monitoring, permission verification; the design mode should be selected based on specific requirements: encapsulate private numbers
2025-07-27
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491
How do I Calculate Age from Date of Birth in PHP and MySQL?
Article Introduction：This article discusses two methods for determining the age of an individual based on their date of birth using PHP and MySQL. The PHP method employs the DateTime class to compute the age difference. The MySQL method utilizes the TIMESTAMPDIFF() funct
2024-10-24
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398
What are design patterns, and how can they be used in PHP?
Article Introduction：Common applications of design patterns in PHP include Singleton, Factory, Observer, and Strategy. They are reusable templates to solve duplication problems, not code that is directly copied. Use scenarios include code duplication, project size expansion, improved testability and reduced dependency. The application steps are: first understand the problem, then select the appropriate mode, keep it simple to implement, and can be reconstructed and optimized later. For example, Factory mode can be used to return different database instances based on configuration, thereby simplifying maintenance.
2025-06-23
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782
Cross-time zone data aggregation: Time processing strategies in MySQL and PHP
Article Introduction：This article aims to guide developers how to efficiently process time data across time zones in MySQL and PHP, especially when aggregation operations such as MIN/MAX are required based on the user-specified time zone. The article elaborates on the configuration and use of the MySQL CONVERT_TZ function, as well as the application of the PHP DateTime class, and provides specific code examples and best practice suggestions.
2025-08-24
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846
How to get datetime aggregated data by user time zone in MySQL and PHP
Article Introduction：This article elaborates on strategies for handling multi-time zone date-time aggregation in MySQL databases and PHP applications. By explaining MySQL's CONVERT_TZ function and its dependence on time zone system tables, as well as the powerful time zone conversion capabilities provided by the PHP DateTime class, this tutorial aims to guide developers how to accurately filter, group and aggregate data based on the user-specified time zone, thereby avoiding calculation errors caused by time zone differences.
2025-08-24
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649
How to implement multi-time zone date-time conversion and aggregation in MySQL and PHP
Article Introduction：This tutorial is designed to guide developers on how to efficiently handle multi-time zone datetimes in MySQL databases and PHP applications. We will explore in-depth MySQL's CONVERT_TZ function and its time zone table configuration, as well as the flexible use of the PHP DateTime class. The article will focus on how to implement MIN/MAX data aggregation based on the user-specified time zone boundary, provide detailed code examples, precautions and performance optimization suggestions to ensure the accuracy and consistency of date and time data in global applications.
2025-08-25
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727
Is Your PHP Switch a Code Smell? Identifying and Refactoring Anti-Patterns
Article Introduction：Yes, the switch statement in PHP itself is not a code smell, but when it is repeated in multiple files, contains too many branches, is tightly coupled with business logic, violates the principle of single responsibility, or makes judgments based on object types, it becomes an anti-pattern; 1. Use policy mode processing factory: define processing interfaces and concrete classes, map types to processors through factory mapping, add new types only requires registration and no modification of existing code; 2. Use class-based distribution (polymorphism): let the object itself determine behavior, implement concrete logic by inheriting abstract classes, and directly execute methods when calling without switching; 3. Use closure mapping (suitable for simple scenarios): Use associative arrays to store the mapping of type to closures, avoid branch structure but are less testable; 4. PHP8 can be used
2025-08-02
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263
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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909
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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1524
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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