AFAIK, this kind of information is from serialize[1] and unserialize php functions. See the information from Mediawiki table documentation[2]

[1] https://www.php.net/manual/en/function.serialize.php
[2] https://www.mediawiki.org/wiki/Manual:Logging_table#log_params

On Wed, Dec 4, 2019 at 9:50 PM Roy Smith <roy@panix.com> wrote:
Is there a description somewhere of what the log_params mean in this query?

MariaDB [enwiki_p]> select log_params from logging_logindex where log_namespace = 2 and log_title = 'RoySmith-testing' and log_type = 'block' order by log_timestamp asc;
+---------------------------------------------------------------------------------------------------------+
| log_params                                                                                              |
+---------------------------------------------------------------------------------------------------------+
| a:3:{s:11:"5::duration";s:9:"5 minutes";s:8:"6::flags";s:11:"noautoblock";s:8:"sitewide";b:1;}          |
| a:3:{s:11:"5::duration";s:9:"5 minutes";s:8:"6::flags";s:20:"nocreate,noautoblock";s:8:"sitewide";b:1;} |
| a:0:{}                                                                                                  |
+---------------------------------------------------------------------------------------------------------+
3 rows in set (0.00 sec)


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Dennis Tobar Calderón
Ingeniero en Informática UTEM