Course Introduction：GD and Imagick can be used for PHP image processing, GD is suitable for thumbnails and watermarks, and Imagick supports advanced effects. It requires enabling extensions and verification of input, freeing memory, and ensuring upload security.
2025-08-27 comment 0 429
Course 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 comment 0 365
Course Introduction：In PHP, implementing polymorphism can be achieved through method rewriting, interfaces, and type prompts. 1) Method rewriting: Subclasses override parent class methods and perform different behaviors according to object type. 2) Interface: The class implements multiple interfaces to realize polymorphism. 3) Type prompt: Ensure that the function parameters are specific to the type and achieve polymorphism.
2025-05-20 comment 0 1131
Course Introduction：An interface is a contract that defines the methods that a class must implement. A class can implement multiple interfaces; an abstract class is a semi-finished class that cannot be instantiated and can contain abstract methods and concrete implementations. Subclasses can only inherit one abstract class. For example, the Logger interface specifies a log method, and FileLogger implements it; Animal abstract class has abstract method makeSound and concrete method sleep, and Dog inherits and implements makeSound. Use interfaces to define common behaviors, such as payment interfaces; use abstract classes to adapt to shared logic, such as public methods of animal systems. Other details: The interface method defaults to public; abstract classes can have constructors; PHP8 supports interface default methods.
2025-07-08 comment 0 690
Course Introduction：How do you use StringIO in Python3?StringIO is a class that implements a file-like object in memory. It can be used to read and write strings to...
2024-11-02 comment 0 721
Course Elementary 13880
Course Introduction：Scala Tutorial Scala is a multi-paradigm programming language, designed to integrate various features of object-oriented programming and functional programming.
Course Elementary 82435
Course Introduction："CSS Online Manual" is the official CSS online reference manual. This CSS online development manual contains various CSS properties, definitions, usage methods, example operations, etc. It is an indispensable online query manual for WEB programming learners and developers! CSS: Cascading Style Sheets (English full name: Cascading Style Sheets) is an application used to express HTML (Standard Universal Markup Language).
Course Elementary 13230
Course Introduction：SVG is a markup language for vector graphics in HTML5. It maintains powerful drawing capabilities and at the same time has a very high-end interface to operate graphics by directly operating Dom nodes. This "SVG Tutorial" is intended to allow students to master the SVG language and some of its corresponding APIs, combined with the knowledge of 2D drawing, so that students can render and control complex graphics on the page.
Course Elementary 24687
Course Introduction：In the "AngularJS Chinese Reference Manual", AngularJS extends HTML with new attributes and expressions. AngularJS can build a single page application (SPAs: Single Page Applications). AngularJS is very easy to learn.
Course Elementary 27533
Course Introduction：Go is a new language, a concurrent, garbage-collected, fast-compiled language. It can compile a large Go program in a few seconds on a single computer. Go provides a model for software construction that makes dependency analysis easier and avoids most C-style include files and library headers. Go is a statically typed language, and its type system has no hierarchy. Therefore users do not need to spend time defining relationships between types, which feels more lightweight than typical object-oriented languages. Go is a completely garbage-collected language and provides basic support for concurrent execution and communication. By its design, Go is intended to provide a method for constructing system software on multi-core machines.
2019-09-03 23:33:27 0 1 1354
Reworded title: Why doesn't PHP handle "class not found" errors?
2024-01-03 19:53:41 0 2 646
PHP refers to the Prince class, and the page prompts that the PDF cannot be loaded.
2019-10-16 10:57:38 0 2 1268
The oci_parse() method returns null parsing method
2024-01-29 13:46:11 0 1 711
php - How to add methods to an instance?
2017-06-29 10:07:59 0 2 941
