libkadm5-1.17-15.fc30 in the recent krb5 update has a libkadm5clnt_mit.so.12.0. php-pecl-krb5-1.1.2-4.fc30 requires libkadm5clnt_mit.so.11 and needs to be rebuilt so that its users can take the Kerberos package updates.
See https://bodhi.fedoraproject.org/updates/FEDORA-2020-0b184b7429
php-pecl-krb5-1.1.2-4.fc30.1 has been pushed to the Fedora 30 testing repository. If problems still persist, please make note of it in this bug report. See https://fedoraproject.org/wiki/QA:Updates_Testing for instructions on how to install test updates. You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2020-0b184b7429
For the record, php-pecl-krb5 is linking against MIT krb5 API that is explicitly marked as not a stable one in upstream: /* * This API is not considered as stable as the main krb5 API. * * - We may make arbitrary incompatible changes between feature * releases (e.g. from 1.7 to 1.8). * - We will make some effort to avoid making incompatible changes for * bugfix releases, but will make them if necessary. */ In particular, version 12 of libkadm5clnt_mit.so removed Kerberos v4 support with the commit 752187a441ed0f301f1a8adb1fea843080ac8c97 in April 2019.
php-pecl-krb5-1.1.2-4.fc30.1 has been pushed to the Fedora 30 stable repository. If problems still persist, please make note of it in this bug report.