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To transform a database column value into an array while constructing a query using Laravel's query builder and utilize the "whereIn" method, you can use the "explode" and "trim" functions in combination with the "whereIn" method as shown below:

$searchValue = "value1, value2, value3";
$searchArray = array_map('trim', explode(',', $searchValue));

$results = DB::table('table_name')
    ->whereIn('column_name', $searchArray)
    ->get();

Here, we first use the "explode" function to split the comma-separated string into an array of values. We then use the "array_map" function with the "trim" function to remove any whitespace from the values. Finally, we pass the resulting array into the "whereIn" method of the query builder to retrieve the matching records.