为了防止PHP网站被挂马和恶意挂马，可以采取以下措施：，1. 安装并配置防火墙：使用防火墙可以阻止未经授权的访问。，2. 使用SSL证书：HTTPS协议能有效防止数据泄露。，3. 检查文件权限：确保只有需要的用户有访问权限。，4. 更新插件和库：及时更新所有插件和库以避免已知漏洞。，5. 避免在公共服务器上运行：尽量不在公共服务器上部署PHP应用程序。，6. 禁止外部脚本执行：限制用户执行外部脚本，以防止他们上传有害代码。，7. 使用防篡改技术：如密码保护、文件签名等，以防止用户意外更改敏感信息。

In today's network environment, numerous malicious software and viruses will infiltrate PHP websites through various means to prevent these threats from damaging the website, here are some measures that can be taken:

1. Install and update security plugins: Using tools such as Wordfence can help detect and block malicious code.

2. Validate user input data: Ensure all user inputs in your application are safe and unmodified.

3. Enable HTTPS: Enabling HTTPS can protect your site from being hijacked.

4. Regular backups: Regularly backup databases to prevent data loss and promptly recover systems.

5. Monitor log files: Monitor system logs for any abnormal beh*ior so that you can respond immediately when an anomaly is detected.

By implementing these measures, you can effectively prevent PHP websites from being infected with malware.