PHP form protection tips: Use protective database scripts

With the popularization of the Internet and the development of e-commerce, more and more websites have various degrees of security risks. Especially for websites that involve user data interaction, how to ensure the security of user data has become a major problem faced by website developers. In this regard, PHP form protection skills are particularly important.

PHP is a programming language widely used in web development. Its form protection skills mainly include two aspects, one is form data verification, and the other is protecting the database. This article will focus on how to use database script protection to improve the security protection capabilities of PHP forms.

1. Protecting the database

Protecting the database refers to using a series of means to protect the database to prevent hackers from attacking and destroying the database. Common means of protecting databases include backup, encryption, deletion of useless data, permission control, etc. Among them, the most important means is permission control.

Permission control refers to granting different database access permissions to different users or roles. How to set different permissions? This can be achieved through the following three points:

1. Avoid using the super user

The super user has the authority to modify all contents of the database, so you should avoid using the super user. Accordingly, different permissions should be set for different users so that user access can be restricted as needed.

2. Use the principle of least privilege

The principle of least privilege refers to giving users or roles the least necessary permissions. For example, if a user only needs access to a certain field in the database, then you only need to give the user access rights to that field. This can effectively avoid the impact of some unnecessary operations on the database.

3. Set Password

Set a password for all users or roles to effectively control their access to the database. For some important users, passwords should be changed regularly to ensure security.

2. Use protective database scripts

Protecting database scripts is a method that can help developers improve the security of PHP forms. There are many protective database scripts in the PHP language, such as htmlspecialchars(), addslashes(), mysqli_real_escape_string(), etc. Below we will delve into two of the more commonly used scripts: htmlspecialchars() and addslashes().

1. htmlspecialchars()

htmlspecialchars() is a function that converts HTML tags into HTML entities. It can well protect against attacks in which data is injected into HTML code. . For example, enter the following code into the form:

<script>alert('Hello World!');</script>

Without adding htmlspecialchars(), the code will be displayed directly in the HTML page. If a malicious attacker submits the same code through the form, The submitted code will also be displayed directly in the HTML page, making the attacked website easily vulnerable. The addition of htmlspecialchars() will convert the code into HTML entities, thus avoiding this problem.

2. addslashes()

addslashes() is a function that escapes special characters such as single quotes and double quotes into a form with a slash. It can be easily Good protection of data from SQL injection attacks. For example, enter the following code into the form:

' or 1=1 #

Without adding addslashes(), this code will lead to SQL injection attacks. Adding addslashes() will escape the code as:

' or 1=1 #

to prevent malicious attackers from successfully performing SQL injection.

Summary

PHP form protection skills are important content that must be understood in the web development process. This article mainly introduces how to use protective database scripts to improve the security protection capabilities of PHP forms, including protecting databases and using protective database scripts. In actual development, developers should flexibly use these techniques according to actual conditions to improve website security.

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