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set_col_edittype - Display a empty/blank value in dropdown

i have below code to set column edit type to select 
$dg -> set_col_edittype("status", "select", "1:Open;2:Closed;3:WIP");
When any row is selected, it allows me to select one of above values. 

However when the grid loads the column shows blank values, i.e. it does not display pre-existing values in database.

Add a blank to your key value pair string with a leading colon and semicolon.

For example:

Using SQL SELECT query? Please refer to this KB:

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