MasterPress 1.3.1 is a compatibility release for PHP 8 and WordPress 5.7. It still remains backwards compatible with older PHP versions.
MPFT :: col()
A default implementation to return content for this field that is appropriate for the display of the field in a column in Post and Term management screens in WordPress. This implementation simply returns the value returned by --to-string.
Note: this method is intended for internal use and should not be called directly.