Detailed introduction to basic applications
The structure of a namespace is very similar to that of a file system. Folders can have subfolders, and namespaces can also define subspaces to describe the ownership relationships between each space. The previous chapter introduced what is a namespace? As well as the basic applications of PHP namespaces, here we start to understand the subspaces and public spaces of namespaces. The following example illustrates what subspace is. For example, the two modules cart and order are both in the same shop project, and the relationship is expressed through the namespace subspace. The code looks like this:
1. php namespace: detailed explanation of subspace and public space instances
##Introduction: The structure of a namespace is very similar to that of a file system. Folders can have subfolders, and namespaces can also define subspaces to describe the ownership relationships between spaces. The previous chapter introduced what is a namespace? As well as the basic applications of PHP namespaces, here we start to understand the subspaces and public spaces of namespaces.
2. What is a namespace? Basic application sharing of PHP namespace
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Introduction to socket.io learning tutorial in node.js (2)
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Basic application of PHP regular expressions
##Introduction: Basic application of PHP regular expressions
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Basic application of PHP functions
Introduction: Basic application of PHP functions
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Basic application of for loop in PHP: Nine-Nine Multiplication Table
Introduction: The basic application of for loop in PHP and the nine-nine multiplication table
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Let’s learn about nginx together - basic introduction + single point installation + basic application nginx apache nginx php nginx rewriteIntroduction: nginx: Let’s learn about nginx together - basic introduction + single point installation + basic application: With the development of technology, the programs designed by Siege Lions can already be used for free for fault tolerance and access sharing load, so today I will take you with me Learn about nginx and the single point installation of nginx. 1. What is nginx Nginx is a high-performance http server/reverse proxy server and email (IMAP/POP3) proxy server. Developed by Russian programmer Igor Sysoev, the official test nginx can support 50,000 concurrent connections, and cpu, memory
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evacuate the dancefloor PHP introductory learning knowledge Point 8: Basic application of for loop in PHP: Nine-Nine Multiplication Oral TableIntroduction: evacuate the dancefloor:evacuate the dancefloor PHP introductory learning knowledge points eight basic applications of for loops in PHP: ninety-nine multiplication tables: copy the code The code is as follows: Introduction: photoshop cs2 v9.0 Green Chinese version: photoshop cs2 v9.0 Green Chinese version PHP introductory learning knowledge points Seven basic applications of PHP functions: Copy the code as follows:$con"; } $str=" Simple function test! "; echo "Normal text: $str Introduction: PHP Regular: PHP Regular PHP Getting Started Learning Knowledge Point Four PHP Basic application of regular expressions: Copy the code as follows:"; }else{ echo "no"; } if(ereg("([A-Z]{3,})", "aaa")){ echo "yes"; }else{ echo "Lowercase cannot be matched! [Related Q&A recommendations]: php - redis+mysql basic application The above is the detailed content of Detailed introduction to basic applications. For more information, please follow other related articles on the PHP Chinese website! AI-powered app for creating realistic nude photos Online AI tool for removing clothes from photos. Undress images for free AI clothes remover Swap faces in any video effortlessly with our completely free AI face swap tool! Easy-to-use and free code editor Chinese version, very easy to use Powerful PHP integrated development environment Visual web development tools God-level code editing software (SublimeText3) JWT is an open standard based on JSON, used to securely transmit information between parties, mainly for identity authentication and information exchange. 1. JWT consists of three parts: Header, Payload and Signature. 2. The working principle of JWT includes three steps: generating JWT, verifying JWT and parsing Payload. 3. When using JWT for authentication in PHP, JWT can be generated and verified, and user role and permission information can be included in advanced usage. 4. Common errors include signature verification failure, token expiration, and payload oversized. Debugging skills include using debugging tools and logging. 5. Performance optimization and best practices include using appropriate signature algorithms, setting validity periods reasonably, The enumeration function in PHP8.1 enhances the clarity and type safety of the code by defining named constants. 1) Enumerations can be integers, strings or objects, improving code readability and type safety. 2) Enumeration is based on class and supports object-oriented features such as traversal and reflection. 3) Enumeration can be used for comparison and assignment to ensure type safety. 4) Enumeration supports adding methods to implement complex logic. 5) Strict type checking and error handling can avoid common errors. 6) Enumeration reduces magic value and improves maintainability, but pay attention to performance optimization. Session hijacking can be achieved through the following steps: 1. Obtain the session ID, 2. Use the session ID, 3. Keep the session active. The methods to prevent session hijacking in PHP include: 1. Use the session_regenerate_id() function to regenerate the session ID, 2. Store session data through the database, 3. Ensure that all session data is transmitted through HTTPS. 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. Static binding (static::) implements late static binding (LSB) in PHP, allowing calling classes to be referenced in static contexts rather than defining classes. 1) The parsing process is performed at runtime, 2) Look up the call class in the inheritance relationship, 3) It may bring performance overhead. RESTAPI design principles include resource definition, URI design, HTTP method usage, status code usage, version control, and HATEOAS. 1. Resources should be represented by nouns and maintained at a hierarchy. 2. HTTP methods should conform to their semantics, such as GET is used to obtain resources. 3. The status code should be used correctly, such as 404 means that the resource does not exist. 4. Version control can be implemented through URI or header. 5. HATEOAS boots client operations through links in response. In PHP, exception handling is achieved through the try, catch, finally, and throw keywords. 1) The try block surrounds the code that may throw exceptions; 2) The catch block handles exceptions; 3) Finally block ensures that the code is always executed; 4) throw is used to manually throw exceptions. These mechanisms help improve the robustness and maintainability of your code. The main function of anonymous classes in PHP is to create one-time objects. 1. Anonymous classes allow classes without names to be directly defined in the code, which is suitable for temporary requirements. 2. They can inherit classes or implement interfaces to increase flexibility. 3. Pay attention to performance and code readability when using it, and avoid repeatedly defining the same anonymous classes.
"; echo ""; for($i=1;$i<=9;$i++ ){ echo "
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