Found a total of 10000 related content
How to implement array LRU cache in PHP?
Article Introduction：Implementing LRU cache in PHP can simulate bidirectional linked list structure by using associative arrays and index arrays. The specific steps are as follows: 1. Create an LRUCache class and initialize an array of capacity, cache and access order. 2. Implement the get method, return the value and update the access order. 3. Implement the put method, add or update elements, and remove the longest-lasting elements if necessary. This method is simple and easy to understand, but performance may decline under large data volumes.
2025-05-23
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711
PHP Master | Adding Text Watermarks with Imagick
Article Introduction：Imagick PHP extension library details: Add text watermark to images
This article will explain how to use PHP's Imagick extension library to add text watermarks to images. We will explore a variety of methods, including simple text overlay, creating transparent text watermarks using font masks, and more advanced text tiling techniques.
Key points:
Imagick is a powerful PHP extension library that can be used to process images, including adding text watermarks.
Text watermarking can be achieved by creating an Imagick class instance, reading an image, setting the font properties using the ImagickDraw instance, and then adding text to the image using the annotateImage() method.
There are many ways to add text
2025-02-25
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383
How can you use a function as a callback in PHP?
Article Introduction：In PHP, there are four methods to use callback functions, namely: 1. Use named functions as callbacks, by passing the function name as a string to functions such as array_map; 2. Use anonymous functions (closures), which are suitable for situations where logic is simple and only used once; 3. Use object methods as callbacks, by passing an array containing object and method names; 4. Use static methods as callbacks, you can add strings of method names through array syntax or class names. Each method has its applicable scenarios, and it is necessary to ensure that the callback is accessible and its validity can be verified through is_callable().
2025-07-21
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425
PHP Master | Functional Programming in PHP
Article Introduction：Many programmers like to talk about functional programming, but if you ask them if they have actually used it, most of the answers will be "no". The reason is simple: When we beginners in programming, we are taught to think in an imperative way, namely program flowcharts and steps. Therefore, this article will explain some important concepts of functional programming and how to write functional code in PHP.
Key Points
Functional programming treats calculations as evaluation of mathematical functions, and avoids state and mutable data, treating functions as first-class citizens. This means that functions can be used like values ??in imperative programming.
Key concepts of functional programming include invariance (once defined, the value of a variable cannot be changed), recursion (used frequently due to invariance), pure functions (functions without side effects)
2025-02-24
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584
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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273
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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935
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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1556
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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1125
Terraria: How To Make A Loom
Article Introduction：There are a lot of crafting stations that you can make in Terraria. This ranges from simple anvils to unique stations meant for one specific type of resource. Early into the game, you'll be able to make your own Loom, which is primarily used to make
2025-01-10
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1458
