Found a total of 10000 related content
Multi-file upload class implemented in PHP and usage examples, _PHP tutorial
Article Introduction：Multi-file upload class implemented in PHP and usage examples. Multi-file upload class and usage examples implemented in PHP. This article describes the multi-file upload class and usage examples implemented in PHP. Share it with everyone for your reference, the details are as follows: 1. upFiles.css.php
2016-07-12
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1139
How to Install Magento on Rocky Linux and AlmaLinux
Article Introduction：Written in PHP, Magento is a popular open-source, and versatile eCommerce platform that provides businesses with an online shopping cart. It leverages various PHP frameworks such as Symfony and Laminas to enhance its functionality and usability.
Mage
2025-07-08
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750
How to implement data grouping in PHP?
Article Introduction：Implementing data packets in PHP can be implemented through array operations and loops. 1) Use loops and array operations to group student data by class; 2) Statistical analysis can be performed when grouping, such as calculating the number of students in each class; 3) Multi-level grouping can be implemented, such as grouping by class and gender, but attention should be paid to performance and memory usage.
2025-05-23
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430
PHP in Action: Real-World Examples and Applications
Article Introduction：PHP is widely used in e-commerce, content management systems and API development. 1) E-commerce: used for shopping cart function and payment processing. 2) Content management system: used for dynamic content generation and user management. 3) API development: used for RESTful API development and API security. Through performance optimization and best practices, the efficiency and maintainability of PHP applications are improved.
2025-04-14
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1058
PHP implements techniques for adding text and image watermarks when uploading images,
Article Introduction：PHP techniques for adding text and image watermarks when uploading images. PHP implements techniques for adding text and image watermarks when uploading images. The functions implemented in this article are particularly suitable for some shopping malls and image sites. It shares the method of adding text and image watermarks when uploading images.
2016-07-06
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1084
PHP techniques for adding text and image watermarks when uploading images, _PHP tutorial
Article Introduction：PHP techniques for adding text and image watermarks when uploading images. PHP implements techniques for adding text and image watermarks when uploading images. The functions implemented in this article are particularly suitable for some shopping malls and image sites. It shares the method of adding text and image watermarks when uploading images.
2016-07-12
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1058
What is the main purpose of using sessions in PHP?
Article Introduction：The main purpose of using sessions in PHP is to maintain the status of the user between different pages. 1) The session is started through the session_start() function, creating a unique session ID and storing it in the user cookie. 2) Session data is saved on the server, allowing data to be passed between different requests, such as login status and shopping cart content.
2025-04-22
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598
What are Weak References in PHP and when are they useful?
Article Introduction：In PHP, weak references are implemented through the WeakReference class and will not prevent the garbage collector from reclaiming objects. Weak references are suitable for scenarios such as caching systems and event listeners. It should be noted that it cannot guarantee the survival of objects and that garbage collection may be delayed.
2025-04-12
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1120
What is a session in PHP, and why are they used?
Article Introduction：Session in PHP is a mechanism for saving user data on the server side to maintain state between multiple requests. Specifically, 1) the session is started by the session_start() function, and data is stored and read through the $_SESSION super global array; 2) the session data is stored in the server's temporary files by default, but can be optimized through database or memory storage; 3) the session can be used to realize user login status tracking and shopping cart management functions; 4) Pay attention to the secure transmission and performance optimization of the session to ensure the security and efficiency of the application.
2025-05-04
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589
How do I use the __len__ method to define the length of an object in Python?
Article Introduction：To customize the object length returned by the len() function in Python, implement the __len__ method in the class and make sure it returns a non-negative integer. 1. The __len__ method does not accept parameters other than self and is used to define the concept of "length" of the object; 2. If the method is not implemented, calling len() will throw a TypeError; 3. The return value must be an integer and should have practical significance, such as representing the number of elements in the container; 4. Commonly used in classes similar to container or sequence behavior, such as shopping carts, custom lists, etc.; 5. Returning non-integral or negative numbers will cause an error or do not comply with the specifications; 6. Performance and consistency should be considered during implementation to make the class more "Pythonic" style.
2025-06-29
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865
How to implement hook function in PHP?
Article Introduction：Implementing hook functions in PHP can be implemented through observer mode or event-driven programming. The specific steps are as follows: 1. Create a HookManager class to register and trigger hooks. 2. Use the registerHook method to register the hook and trigger the hook by the triggerHook method when needed. Hook functions can improve the scalability and flexibility of the code, but pay attention to performance overhead and debugging complexity.
2025-05-15
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294
How do abstract classes differ from interfaces in PHP, and when would you use each?
Article Introduction：Abstract classes and interfaces have their own uses in PHP. 1. Abstract classes are used to share code, support constructors and control access, and include abstract methods and concrete methods. 2. The interface is used to define behavior contracts. All methods must be implemented and are public by default, and support multiple inheritance. 3. Since PHP8, the interface can contain default methods to implement, but there is still no constructor or state. 4. When using abstract classes, you need to encapsulate implementation details; when using interfaces, you need to define cross-class behavior or build plug-in systems. 5. Can be used in combination: abstract classes implement interfaces or combine multiple interfaces into one abstract class. Select whether the structure plus sharing behavior (abstract class) or only the structure (interface).
2025-06-04
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1103
Describe the SOLID principles and how they apply to PHP development.
Article Introduction：The application of SOLID principle in PHP development includes: 1. Single responsibility principle (SRP): Each class is responsible for only one function. 2. Open and close principle (OCP): Changes are achieved through extension rather than modification. 3. Lisch's Substitution Principle (LSP): Subclasses can replace base classes without affecting program accuracy. 4. Interface isolation principle (ISP): Use fine-grained interfaces to avoid dependencies and unused methods. 5. Dependency inversion principle (DIP): High and low-level modules rely on abstraction and are implemented through dependency injection.
2025-04-03
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1102
php get unix timestamp from date
Article Introduction：Getting the Unix timestamp corresponding to dates in PHP can be implemented in a variety of ways. Common methods include: 1. Use the strtotime() function to apply to date strings in common formats, which are concise but sensitive to formats; 2. Use DateTime::createFromFormat() is more suitable for parsing date strings in fixed specific formats to improve accuracy; 3. When processing dates with time zone information, you can use the DateTime class to combine getTimestamp() or strtotime() to parse the time zone, and the time zone can be adjusted uniformly. Select the appropriate method according to the scene and pay attention to input verification to avoid errors.
2025-07-05
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188
Can you explain the SOLID principles and how they apply to PHP OOP design?
Article Introduction：SOLID principle improves code maintainability and scalability through five core principles in PHP object-oriented design. 1. The single responsibility principle (SRP) requires that each class has only one responsibility, and the separation of concerns is achieved through splitting functions; 2. The opening and closing principle (OCP) advocates extending behavior through interfaces or combinations rather than modifying the original code; 3. The Richter replacement principle (LSP) ensures that subclasses can replace the parent class without destroying logic and avoid behavior inconsistencies; 4. The interface isolation principle (ISP) recommends defining fine-grained interfaces to avoid redundant dependencies; 5. The dependency inversion principle (DIP) decoupling high-level and underlying modules by relying on abstract types (such as interfaces) rather than concrete implementation, and is commonly implemented by dependency injection.
2025-06-19
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627
What are Weak Maps in PHP?
Article Introduction：PHP does not have a built-in WeakMap type, but similar functions can be implemented through the WeakMap class provided by the WeakrefPECL extension. The key feature of WeakMap is that its keys are stored in a weak reference manner, avoiding preventing garbage collection and thus preventing memory leaks. When using it, you must first install and enable the Weakref extension. After creating a WeakMap instance, the object is stored as a key, and it will be automatically cleaned when there are no other references to the object. Applicable scenarios include: 1. Cache object-related data; 2. Add metadata to the object; 3. Avoid memory leaks in the event system. Notes include: 1. WeakMap is not a PHP core function; 2. The key must be an object; 3. The entry clearing time is uncontrollable. If the deployment environment allows,
2025-06-27
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352
