The tag is present in Lintian version 2.104.234. That is the most recent version we know about.
This package appears to be covered by version 3.0 (exactly) of the PHP license. This license is not applicable to anything that is not PHP and has no contributions from the PHP Group.
This tag is not emitted for packages from pecl.php.net as determined by
Source: field in
Refer to https://ftp-master.debian.org/REJECT-FAQ.html for details.