How to prevent PHP code from being illegally intruded and attacked

How to prevent PHP code from being illegally intruded and attacked

Introduction:

Protect our PHP code under today’s constant risk of cyberattacks Protection from illegal intrusions and attacks becomes critical. This article will introduce some effective methods and specific code examples to help developers build more secure PHP applications.

1. Use the latest version of PHP and related software

Always using the latest version of PHP is the first step to protect code security. Each new version contains updates and fixes for security vulnerabilities discovered in previous versions. Additionally, the latest versions of PHP extensions and database software should be used to ensure the overall security of the application.

Sample code:

phpinfo();
?>

The above code will display the currently running PHP version and related Software details.

2. Filter input data

Input data is the main target for attackers to invade and attack. Therefore, filtering and validating user input data is key to more secure PHP development. Here is some sample code on how to filter and validate user input.

1. Filter HTML tags

$userInput = $_POST['userInput'];
$filteredInput = strip_tags($userInput);

The above code will remove all HTML tags from user input, preventing potential XSS attacks.

2. Email verification

$email = $_POST['email'];

if (!filter_var($email, FILTER_VALIDATE_EMAIL)) {

echo "无效的邮箱地址";

}

The above code uses the filter_var function and FILTER_VALIDATE_EMAIL to filter and verify the format of the email address.

3. Use prepared statements to prevent SQL injection attacks

SQL injection attacks are common attacks that perform illegal operations by injecting malicious SQL code into user input. Using prepared statements is an effective way to prevent SQL injection attacks.

Sample code:

$username = $_POST['username'];
$password = $_POST['password'];

$stmt = $ pdo->prepare("SELECT * FROM users WHERE username = :username AND password = :password");
$stmt->bindParam(':username', $username);
$stmt-> ;bindParam(':password', $password);
$stmt->execute();

The above code uses prepared statements and bindParam function to bind the value entered by the user to prevent malicious SQL Code injection.

4. Use hash function to store passwords

When storing user passwords, never store plain text passwords directly. Instead, use a hash function to hash the user password and store the hashed value in the database.

Sample code:

$password = $_POST['password'];
$hashedPassword = password_hash($password, PASSWORD_DEFAULT);

The above code uses The password_hash function hashes the user password and stores the hashed password in the database.

Conclusion:

Protecting PHP code from illegal intrusions and attacks is an ongoing task that requires constant attention to the latest security vulnerabilities and risks. By using the latest version of PHP and related software, filtering input data, using prepared statements to prevent SQL injection attacks, and using hash functions to store passwords, you can effectively improve the security of your application. At the same time, you should continue to learn and understand new security protection technologies to adapt to changing network threats.

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