How to remove useless code from php

PHP (Hypertext Preprocessor) is a popular programming language used for creating websites and applications. Although PHP's super functionality and flexibility make it the first choice for developers, problems may arise when writing PHP scripts: useless program code will be generated due to program implementation and design issues. These useless codes will slow down the program, take up space and reduce performance. So how to remove useless code when writing PHP programs?

This article will introduce how to remove useless code in PHP. Before that, we need to understand the basic knowledge about PHP defect scanning and code review tools. These tools are designed to check code for security and quality issues.

1. Check the PHP script

In order to check whether there are any potential problems in the PHP source code, we can use the PHP code review tool.

1. PHP_CodeSniffer

PHP_CodeSniffer is an open source tool that can be used to check PHP source code for compliance with specific process rules. It can automatically detect errors and warnings in the code and improve code standardization and readability. Use PHP_CodeSniffer to help you understand problems with your code and share with others how you inspect your code. Additionally, the tool can be used to make changes and resolve code issues.

2. PHPLint

PHPLint is a powerful tool that can be used to check PHP source code for syntax errors and PHP best practices. This tool is also used to standardize code style and improve code quality, and can pre-fix some problems before code review.

3. PHP Mess Detector

PHP Mess Detector is a professional tool that can be used to check code smells in PHP source code. It can perform static code analysis to check the consistency, complexity and structure of the code. By using PHP Mess Detector, developers can quickly find problems in their code such as duplicate code, unnecessary structures, and difficult-to-understand code segments.

2. Remove useless code from PHP scripts

File size is very important for storage access speed. When writing PHP programs, you should scan the code and delete unnecessary lines.

Here are some useful ways to remove useless code from PHP scripts:

1. Remove comments

Add lots of comments in the code to benefit others Developers understand and maintain the code. However, annotations do not need to be loaded at runtime, so they are useless code.

You can use the following command to remove comments in PHP code:

php -w script.php > script_clean.php

The above command will output a clean PHP code script without comments.

2. Delete unused files

This is the last method to reduce the file size. If your PHP source code contains multiple PHP files, the unused files should be deleted. Deleting unused files reduces the size of your application and provides faster access.

3. Remove useless spaces and indents

Since indents and spaces take up a lot of space in the code, removing them can reduce the size of the PHP code. Before processing your code, normalize it, setting all indents to tabs or spaces. Use the following command to remove useless spaces and indents:

php -w script.php > script_clean.php

4. Remove useless variables

PHP programmers tend to use temporary variables. But these temporary variables are often unnecessary. And those variables that were not called at the end. Removing them can reduce script size.

5. Delete unused functions and methods

It is also very necessary to remove unused methods. This will reduce script size and prevent distortion.

Conclusion

It can be easier to inspect and clean out useless code in your PHP scripts by using a few tools and a few best practices we have provided. Ensure code is more compact and efficient to reduce response times and improve application performance.

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