To test PHP version compatibility using BlogVault:
Step 1: Go to the BlogVault website and login using your email ID.
Step 2: On the BlogVault site listing page, select the website of your choice.
Step 3: It'll take you to the Site Detail page. In this page, click Add Staging Site.
Step 4: Next select the Backup version and the PHP version you want to stage from the respective drop-down menu. Click Continue.
Step 5: Here you can check the PHP version running on your current Staging site.