TolearnPHPeffectively,startbysettingupalocalserverenvironmentusingtoolslikeXAMPPandacodeeditorlikeVSCode.1)InstallXAMPPforApache,MySQL,andPHP.2)Useacodeeditorforsyntaxsupport.3)TestyoursetupwithasimplePHPfile.Next,learnPHPbasicsincludingvariables,ech

Comments cannot be careless because they want to explain the reasons for the existence of the code rather than the functions, such as compatibility with old interfaces or third-party restrictions, otherwise people who read the code can only rely on guessing. The areas that must be commented include complex conditional judgments, special error handling logic, and temporary bypass restrictions. A more practical way to write comments is to select single-line comments or block comments based on the scene. Use document block comments to explain parameters and return values at the beginning of functions, classes, and files, and keep comments updated. For complex logic, you can add a line to the previous one to summarize the overall intention. At the same time, do not use comments to seal code, but use version control tools.

PHP is suitable for beginners to quickly build local development environments. Use integrated tools such as XAMPP, WAMP or MAMP to install Apache, MySQL and PHP in one click. The project files can be accessed through localhost by putting them in the htdocs directory; 1. Download and install integrated environment tools; 2. Put the project files into the htdocs directory; 3. Browser access corresponding paths to test and run; you can also install PHP separately and configure environment variables, run php-Slocalhost:8000 through the command line to start the built-in server for quick debugging; create a new index.php and write an echo statement to output content, and add variables and condition judgment to experience logical processing capabilities. The key to getting started with PHP is to do it by hand.

The key to setting up PHP is to clarify the installation method, configure php.ini, connect to the web server and enable necessary extensions. 1. Install PHP: Use apt for Linux, Homebrew for Mac, and XAMPP recommended for Windows; 2. Configure php.ini: Adjust error reports, upload restrictions, etc. and restart the server; 3. Use web server: Apache uses mod_php, Nginx uses PHP-FPM; 4. Install commonly used extensions: such as mysqli, json, mbstring, etc. to support full functions.

The key to writing PHP comments is to explain "why" rather than "what to do", unify the team's annotation style, avoid duplicate code comments, and use TODO and FIXME tags reasonably. 1. Comments should focus on explaining the logical reasons behind the code, such as performance optimization, algorithm selection, etc.; 2. The team needs to unify the annotation specifications, such as //, single-line comments, function classes use docblock format, and include @author, @since and other tags; 3. Avoid meaningless annotations that only retell the content of the code, and should supplement the business meaning; 4. Use TODO and FIXME to mark to do things, and can cooperate with tool tracking to ensure that the annotations and code are updated synchronously and improve project maintenance.

PHP is a scripting language used for back-end development. Its basic syntax includes four core parts: 1. PHP tags are used to define the code scope. The most common thing is that if all files are PHP code, closed tags can be omitted to avoid errors; 2. Variables start with $ without declaring types, support strings, integers, floating point numbers, booleans, arrays and objects, and can be cast through (int) and (string), etc. The variable scope is local by default, and global must be used to access global variables; 3. The control structure includes if/else condition judgment and foreach loops, which are used to implement program logic and repetitive task processing; 4. Functions are used to encapsulate code to improve reusability, and support parameter default values and

To learn PHP, you need to master variables and data types, control structures, function definitions and call specifications, and avoid common syntax errors. 1. Variables start with $, case sensitive, and types include strings, integers, booleans, etc.; 2. The control structure supports if/else/loop, and the template can use colon syntax instead of curly braces, foreach can handle arrays conveniently; 3. Functions are defined with function, supporting default parameters and variable parameters; 4. Common errors include missing semicolons, confusion == and ===, splicing characters errors, and improper use of array subscripts.

Comments should explain "why" rather than "what was done", such as explaining business reasons rather than repeating code operations; 2. Add overview comments before complex logic, briefly explaining the process steps to help establish an overall impression; 3. Comments the "strange" code to explain the intention of unconventional writing, and avoid misunderstandings as bugs; 4. Comments are recommended to be concise, use // in single lines, use // in functions/classes/*.../ in order to maintain a unified style; 5. Avoid issues such as out of synchronization with the comments, too long comments or not deletion of the code, and ensure that the comments truly improve the readability and maintenance of the code.