How to avoid PHP code injection attacks in PHP language development?

With the development of network technology, the Internet has entered an era of comprehensive popularization, and various network security issues have also emerged in endlessly. Among them, PHP code injection attack is a common network security problem. It can easily steal user data, destroy the website structure, and even cause the entire system to paralyze, causing irreparable property and mental losses to users. Therefore, how to avoid such attacks during the PHP language development process has become a key skill that developers must master.

1. What is PHP code injection attack?

PHP code injection attack refers to hackers using the characteristics of executable eval(), include(), require() and other functions in PHP to input malicious code through user-submitted forms, URLs, cookies, etc. Path, the process injected into the PHP script for execution. Once the code is executed, the attacker can control access to the website through dangerous functions, command execution, etc., obtain user sensitive information, and then destroy the security of the entire system.

2. Methods to avoid PHP code injection attacks

1. Filter user input

First of all, developers should fully understand the source and format of user data before code development , and perform effective input validation and filtering before receiving user input. For example, regular expression verification is performed on user input, limiting the number and format of input characters to prevent illegal characters from entering the system, thereby avoiding injection attacks.

2. Use PDO and prepared statements

Secondly, developers can use PDO (PHP Data Objects) to connect to the database and use prepared statements (Prepared Statement) to perform database operations. PDO is a database interface extension in PHP. Precompiled statements execute SQL statements and user input separately, and process and verify user input as parameters. This way, injection attacks can be avoided.

3. Disable dangerous functions

In addition, during the development process, developers need to understand and disable dangerous functions, such as: eval(), exec(), system(), etc. These functions have the characteristics of executing arbitrary code and can easily be used by attackers to inject malicious code into the system, thus jeopardizing the security of the entire system.

4. Runtime error handling

Runtime error handling is another effective method to prevent PHP code injection attacks. The implementation principle is to hide the error information by setting display_errors to the off parameter to prevent attackers from obtaining system information or operating status from the error information, thus strengthening the security of the system.

5. Install a firewall

Finally, developers can install firewall software to prevent network attacks from entering the system while the PHP code is running. You can install open source WAF (Web Application Firewall) firewall software, which can help users effectively block various network attacks, thereby protecting developers' system security.

3. Conclusion

In PHP language development, PHP code injection attack is a very dangerous network security threat, posing a great threat to users’ personal information and property. In order to protect the system and user security, developers need to understand the causes and defense methods of injection attacks, and apply these methods to the actual development process to more effectively avoid PHP injection attacks.

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