explode() expects parameter 2 to be string, array given

I'm not sure this module is actively maintained but I share the problem and solution for people who meet the same issue in the future.

Problem/Motivation

When Drupal cron runs and the hook_cron() of this module is invoked, an error occurs.

explode() expects parameter 2 to be string, array given

This occurs in the following line.

    watchdog('smart_ip_ban', 'Following IPs have been unblocked !ips', array('!ips' => explode(', ', $ips)));

Here, $ips is expected to be a string but actually an array.

Proposed resolution

I believe explode() in the above line is wrong and should be implode().

Remaining tasks

- Create a patch
- Review the patch

User interface changes

(None)

API changes

(None)

Data model changes

(None)