Siteler arası komut dosyası çalıştırma saldırısı PHP tarafından nasıl önlenebilir?

Cross-Site Scripting (XSS) is one of the most common types of attacks that can be carried out by executing a script from one site on another. This type of attack occurs when a malicious user injects a script into a vulnerable website, allowing them to send malicious code to other users who visit the site.
To prevent this type of attack, users can take a few simple steps, such as sanitizing user input and using output encoding. Additionally, developers can use a content security policy (CSP) to limit or block the execution of scripts on their site.
Here is an example of PHP code that demonstrates how to use a content security policy to prevent unauthorized scripts from being executed on your site:
```
header(\"Content-Security-Policy: default-src 'self'; script-src 'self' https://trusted-site.com;\");
?>
```
In this example, the `Content-Security-Policy` header is used to set a policy that only allows scripts from the current site and `https://trusted-site.com`. Any other scripts will be blocked from running on the site.
In addition to using a content security policy, users and developers can also employ other security measures such as input validation, output encoding, and using prepared statements to prevent SQL injection attacks.
By following best practices for web security, users and developers can help minimize the risk of cross-site scripting attacks and keep their sites and personal information safe.