std::chrono is used in C to process time, including obtaining the current time, measuring execution time, operation time point and duration, and formatting analysis time. 1. Use std::chrono::system_clock::now() to obtain the current time, which can be converted into a readable string, but the system clock may not be monotonous; 2. Use std::chrono::steady_clock to measure the execution time to ensure monotony, and convert it into milliseconds, seconds and other units through duration_cast; 3. Time point (time_point) and duration (duration) can be interoperable, but attention should be paid to unit compatibility and clock epoch (epoch)

How to start writing your first PHP script? First, set up the local development environment, install XAMPP/MAMP/LAMP, and use a text editor to understand the server's running principle. Secondly, create a file called hello.php, enter the basic code and run the test. Third, learn to use PHP and HTML to achieve dynamic content output. Finally, pay attention to common errors such as missing semicolons, citation issues, and file extension errors, and enable error reports for debugging.

The key to writing PHP comments is to clarify the purpose and specifications. Comments should explain "why" rather than "what was done", avoiding redundancy or too simplicity. 1. Use a unified format, such as docblock (/*/) for class and method descriptions to improve readability and tool compatibility; 2. Emphasize the reasons behind the logic, such as why JS jumps need to be output manually; 3. Add an overview description before complex code, describe the process in steps, and help understand the overall idea; 4. Use TODO and FIXME rationally to mark to-do items and problems to facilitate subsequent tracking and collaboration. Good annotations can reduce communication costs and improve code maintenance efficiency.

JavaSocket programming is the basis of network communication, and data exchange between clients and servers is realized through Socket. 1. Socket in Java is divided into the Socket class used by the client and the ServerSocket class used by the server; 2. When writing a Socket program, you must first start the server listening port, and then initiate the connection by the client; 3. The communication process includes connection establishment, data reading and writing, and stream closure; 4. Precautions include avoiding port conflicts, correctly configuring IP addresses, reasonably closing resources, and supporting multiple clients. Mastering these can realize basic network communication functions.

The key to writing good comments is to explain "why" rather than just "what was done" to improve the readability of the code. 1. Comments should explain logical reasons, such as considerations behind value selection or processing; 2. Use paragraph annotations for complex logic to summarize the overall idea of functions or algorithms; 3. Regularly maintain comments to ensure consistency with the code, avoid misleading, and delete outdated content if necessary; 4. Synchronously check comments when reviewing the code, and record public logic through documents to reduce the burden of code comments.

The key to writing Python's ifelse statements is to understand the logical structure and details. 1. The infrastructure is to execute a piece of code if conditions are established, otherwise the else part is executed, else is optional; 2. Multi-condition judgment is implemented with elif, and it is executed sequentially and stopped once it is met; 3. Nested if is used for further subdivision judgment, it is recommended not to exceed two layers; 4. A ternary expression can be used to replace simple ifelse in a simple scenario. Only by paying attention to indentation, conditional order and logical integrity can we write clear and stable judgment codes.

In Go language, structtags is meta information attached to the structure field, which is used to control serialization, deserialization behavior or provide library configuration. 1.structtags are written in backticks in key:"value" format, such as json:"name", which determines the serialization method of the field; 2. Multiple tags can coexist, and each library parses the required parts, such as json and gorm together; 3. Mapstructure is used to configure mapping, and supports omitting tags and nested structures when the field names are consistent; 4. Pay attention to avoid spelling errors, fields need to be exported, and tags cannot be abused to affect readability. Mastering its usage will help improve development efficiency and generation

The purpose of ensuring_ascii=False is to retain the output of non-ASCII characters as is. When Python processes JSON data, json.dumps() or json.dump() converts Chinese, Japanese and other characters into Unicode escape forms by default, and setting ensure_ascii=False can avoid this behavior and make the output more intuitive; common scenarios include writing files, API return values, and debugging output; when using it, you need to pay attention to cooperating with encoding="utf-8" to prevent garbled code problems.