How to configuring PHP for Virtual Directories in Plesk
To select PHP version for a virtual directory within a website, perform the following steps:
1 – Logged in to Plesk.
2 – Go to Websites & Domains, and find the website’s domain name.
3 – Click Virtual Directories.
4 – Browse to the required directory and click a link with its name.
5 – In the Tools group, click PHP Settings.
6 – Select the required version of PHP and click OK.