For some PHP websites, they need to be configured the PHP version into a specific version of PHP. Like PHP 5.2 up to PHP 5.4 etc
You can set it through the Plesk Control Panel, by following these steps:
- Login to Plesk
- Click your website
- Click Host Setting
- Scroll down to Web scripting and statistics and you will see the PHP Version setting, you can choose the specific version for your website.
- Click OK