Custom Entry in table "layered_filter"

[GroundSurfer]

Hello,

I would like to create a custom filter entry directly in the table "layered_filter".

I understood the the main logic, beside one thing. I have sorted the different features line by line:

s:24:"layered_selection_feat_1";a:2:{s:11:"filter_type";i:2;s:17:"filter_show_limit";i:0;}
s:25:"layered_selection_feat_12";a:2:{s:11:"filter_type";i:2;s:17:"filter_show_limit";i:0;}
s:25:"layered_selection_feat_23";a:2:{s:11:"filter_type";i:2;s:17:"filter_show_limit";i:0;}
s:24:"layered_selection_feat_9";a:2:{s:11:"filter_type";i:2;s:17:"filter_show_limit";i:0;}
s:24:"layered_selection_feat_5";a:2:{s:11:"filter_type";i:0;s:17:"filter_show_limit";i:0;}

Every line starts with "s:24" or "s:25". Can anyone tell me, the logic behind "24" or "25"?

Thanks for your help in advance! 🙂

Bye,

Holger