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Course Introduction：To correctly handle character encoding in PHP, it is necessary to ensure that UTF-8 is used consistently at all levels; 1. Understand the importance of UTF-8, which is a web standard that supports multilingual and emojis; 2. Set correct encoding in the PHP environment, including saving the file as BOM-less UTF-8, using the mbstring function instead of ordinary string functions, and setting mb_internal_encoding and mb_http_output to UTF-8; 3. The database needs to use utf8mb4 character set and corresponding sorting rules, specify CHARACTERSETutf8mb4COLLATEutf8mb4_unicode_ci when creating the table, and pass SE

2025-07-25 comment 0  570

Course Introduction：typeid is an operator used in C to obtain runtime type information and must contain a header file; 1. It can be used for type comparison of basic types. typeid(a).name() returns the compiler-related encoding name, and the types can be judged by comparison. 2. When used in polymorphic classes, only the class defines a virtual function to correctly obtain the dynamic type of the object pointed to by the pointer, otherwise only the static type will be returned; 3. In GCC/Clang, abi::__cxa_demangle can be used in GCC/Clang to convert the encoding name to a readable type name, but this method is a non-standard extension and is not applicable to all compilers; typeid is suitable for debugging and logging scenarios, and should not be used excessively in performance-sensitive code.

2025-08-04 comment 0  221

Course Introduction：To eliminate $GLOBALS in PHP, it should first analyze its usage and then replace global variables with dependency injection, configuring objects, and step-by-step refactoring. 1. Use grep and other tools to find out all the usage of $GLOBALS and record the key names and locations; 2. Replace global variables such as database connections and configurations with explicit dependencies, such as injecting PDO or Config objects through constructors; 3. Create service classes (such as Logger, UserService) to encapsulate functions to avoid function dependence on global state; 4. Centrally manage the configuration, load from the configuration file returning the array, and inject the required classes; 5. Reconstruct the database in a small way, replacing a $GLOBALS reference at a time, and test to ensure consistent behavior; 6. Beware of including

2025-08-03 comment 0  698

Course Introduction：SqlParameter Parameters.Add vs. AddWithValue: Choosing the Best MethodWhen working with SQL commands, you may encounter the need to add...

2025-01-10 comment 0  703

Course 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 comment 0  865

Course Elementary  13825

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  82364

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  13182

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  24630

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  27490

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.