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

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.

A Plesk bug with ID PPPM-13986.

The bug has been fixed in Plesk Obsidian 18.0.53. Install latest updates to fix it.

If it is not possible to update Plesk for some reason, use the following workaround:

Log into Plesk.
Go to Domains > example.com > File Manager.
Click New > Create File and name it phpinfo.php. Click OK.
Open the file phpinfo.php and add the following content to it:

<?php
phpinfo();
?>
To view the phpinfo() page open the http://example.com/phpinfo.php URL in a browser.

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