


40 common bad habits among PHP programmers, how many have you fallen into? , Programmer bad habits_PHP tutorial
40 common bad habits among PHP programmers, how many have you fallen into? , Programmer bad habits
1. Do not write comments
2. Not using IDE tools that can improve productivity
3. Not using version control
4. Do not write code according to programming standards
5. Not using a unified method
6. Don’t think and plan before coding
7. Do not perform coding and security checks before executing sql
8. Do not use test-driven development
9. Do not turn on automatic error reporting (error_reporting) when encoding
10. Not using a good debugging tool
11. Don’t refactor your code
12. Do not use a hierarchical structure such as MVC
13. Don’t know the following concepts: KISS, DRY, MVC, OOP, REST
14. Use print or echo to output things directly in functions or classes instead of returning
15. Don’t use or understand unit testing
16. Return HTMl instead of data, strings, objects and other types
17. Hard code messages and configuration parameters
18. Not optimizing sql query
19. Do not use __autoload
20. Automatic error operation is not supported (should be intelligent error correction)
21. Use $_GET instead of $_POST for dangerous parameter transfer (remember these 40 items are all wrong)
22. Don’t know how to use regular expressions
23. Never heard of sql injection and cross-site scripting (in terms of security, you should understand the English of these two things: sql injection, cross-site scripting)
24. Simple configuration is not supported, passing parameters to the constructor of the class, set/get methods, and defining constants
25. Unable to understand the advantages and disadvantages of OOP
26. No matter how small the thing you want to do is, use OOP
27. Think that making reusable software is OOP
28. Don’t choose intelligent defaults
29. Do not use a single configuration file
30. Don’t want others to see the code, but use .inc to replace .php
31. Do not use database abstraction layer (persistence layer)
32. Don’t DRY (Dont repeat yourself) during development. (Always develop repetitive things)
33. Do not develop classes or methods that can be reused
34. Do not use abstract classes or interface classes, inheritance, polymorphism, or encapsulation.
35. Optimize your program without using existing design patterns.
36. Users are not allowed to define basic directories (this seems not suitable for PHP, after all, it is not based on operating system development)
37. Use namespaces incorrectly and use commonly used words as prefixes. (This will cause conflicts when others use it in the future. For example, define a function called array_push())
38. Do not use table prefixes when using the database (this is very important...)
39. Do not use or use an unfamiliar template engine (to facilitate team development, everyone should use common templates)
40. Don’t look at PHP frameworks (most frameworks contain excellent code and advanced concepts. They are worth learning)
The editor has won almost all of my entries. If you have won less than 30 entries, please don’t leave messages to stimulate me~

Calculating the total number of elements in a PHP multidimensional array can be done using recursive or iterative methods. 1. The recursive method counts by traversing the array and recursively processing nested arrays. 2. The iterative method uses the stack to simulate recursion to avoid depth problems. 3. The array_walk_recursive function can also be implemented, but it requires manual counting.

In PHP, the characteristic of a do-while loop is to ensure that the loop body is executed at least once, and then decide whether to continue the loop based on the conditions. 1) It executes the loop body before conditional checking, suitable for scenarios where operations need to be performed at least once, such as user input verification and menu systems. 2) However, the syntax of the do-while loop can cause confusion among newbies and may add unnecessary performance overhead.

Efficient hashing strings in PHP can use the following methods: 1. Use the md5 function for fast hashing, but is not suitable for password storage. 2. Use the sha256 function to improve security. 3. Use the password_hash function to process passwords to provide the highest security and convenience.

Implementing an array sliding window in PHP can be done by functions slideWindow and slideWindowAverage. 1. Use the slideWindow function to split an array into a fixed-size subarray. 2. Use the slideWindowAverage function to calculate the average value in each window. 3. For real-time data streams, asynchronous processing and outlier detection can be used using ReactPHP.

The __clone method in PHP is used to perform custom operations when object cloning. When cloning an object using the clone keyword, if the object has a __clone method, the method will be automatically called, allowing customized processing during the cloning process, such as resetting the reference type attribute to ensure the independence of the cloned object.

In PHP, goto statements are used to unconditionally jump to specific tags in the program. 1) It can simplify the processing of complex nested loops or conditional statements, but 2) Using goto may make the code difficult to understand and maintain, and 3) It is recommended to give priority to the use of structured control statements. Overall, goto should be used with caution and best practices are followed to ensure the readability and maintainability of the code.

In PHP, data statistics can be achieved by using built-in functions, custom functions, and third-party libraries. 1) Use built-in functions such as array_sum() and count() to perform basic statistics. 2) Write custom functions to calculate complex statistics such as medians. 3) Use the PHP-ML library to perform advanced statistical analysis. Through these methods, data statistics can be performed efficiently.

Yes, anonymous functions in PHP refer to functions without names. They can be passed as parameters to other functions and as return values of functions, making the code more flexible and efficient. When using anonymous functions, you need to pay attention to scope and performance issues.


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