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Update PHP on 1&1 Server with Plesk

Follow the steps below to update your version of PHP using Plesk.

Before you begin, ensure that iptables, IP Sec, or any other firewall/packet filter are not blocking port 8447.

Step 2
Once in the Plesk menu, find Tools & Utilities located under Server Management. Plesk Home menu
Plesk Home menu
Step 3
Under Panel, click on Updates. Panel Overview
Panel Overview
Step 4
Click on Add Components.Summary of Installations and Updates
Summary of Installations and Updates
Step 5
Find the check box that says Different PHP interpreter versions and underneath, check for a newer version that is not currently installed. If a newer version of PHP is available, select it and click on Continue. Addition to product components
Addition to product components
Step 6
As the upgrade runs, a log of actions being performed is shown on the page as well as a progress bar. Such upgrades should take less than 15 minutes. Progress of installation
Progress of installation
Step 7
A message will be displayed when the upgrade has completed successfully. Click OK to return to the update panel or close the session. Process completed
Process completed

For additional information, you may want to reference: