phpinfo() page can not be opened for a Plesk domain: DOMDocument::loadHTML(): Argument #1 ($source) must not be empty

Symptoms

• It is not possible to open phpinfo() page in Plesk > Domains > example.com > PHP Settings with:

  DOMDocument::loadHTML(): Argument #1 ($source) must not be empty

• Manually created phpinfo() scripts are working properly.

• A custom PHP handler installed from 3rd-party or OS repositories is used for the domain.

Cause

A Plesk bug with ID PPPM-13986.

Resolution

Until the bug is fixed, use the following workaround:

1. Log into Plesk.

2. Go to Domains > example.com > File Manager.

3. Click New > Create File and name it phpinfo.php. Click OK.

4. Open the file phpinfo.php and add the following content to it:

   <?php
   phpinfo();
   ?>

5. To view the phpinfo() page open the http://example.com/phpinfo.php URL in a browser.