update column based on another column with custom php function

Hello!
I have table with huge record. I have two columns name_bg and name_en.
I added more two columns ….. ident_bg and ident_en.
But they must have data based on data in name_bg and name_en with some change data.
Here mysql statement who work:

Code (text):

UPDATE firms tu, firms ts

SET

    tu.ident_bg =ts.name_bg,

    tu.ident_en = ts.name_en

WHERE tu.id=ts.id

But i have function which must be applied to the columns ts.name_bg and ts.name_en.
i.e.

Code (text):

Slug::slugify(ts.name_bg)

…
update column based on another column with custom php function

See original post by bumbar