Remove Type Numberic From String And Double Data From Array (php)

I have a problem with duplicate data and I also have a problem with the category code system in the database'

For example I have a parent category with code 'KD-BR' and for subcategories it has a number behind it like 'KD-BR-001'

So what I have to do is remove the number after then the '-' symbol which is located at the end of the string.