To update PHP on an AWS EC2 Bitnami WordPress Multisite website, you can follow these steps:

1. SSH into your EC2 instance using the appropriate private key and the ssh command. For example:Copy codessh -i /path/to/privatekey.pem [email protected]
2. Use the sudo command to gain root access. For example:Copy codesudo -i
3. Use the apt-get command to update the package list and upgrade any installed packages. For example:Copy codeapt-get update && apt-get upgrade
4. Use the apt-get command to install the new version of PHP. For example, to install PHP 7.4:Copy codeapt-get install php7.4
5. Restart the Apache web server to apply the changes:Copy codeservice apache2 restart
6. Verify that the new version of PHP is installed and running by creating a phpinfo.php file in the web root directory and accessing it in a web browser. For example:Copy codeecho "<?php phpinfo(); ?>" > /opt/bitnami/apache2/htdocs/phpinfo.php Then, open http://your-ec2-instance-ip-address/phpinfo.php in a web browser to view the PHP information page.

Note: These steps are specific to the Bitnami WordPress Multisite installation on AWS EC2. The exact steps may vary depending on your specific setup and configuration. It is always recommended to back up your system before making any major changes.