public function findSentinels(array $fields)
    {
        $timestamps = [];
        $deletes = [];
        $fields = $this->removeSentinel($fields, $timestamps, $deletes);

        return [$fields, $timestamps, $deletes];
    }
public function findSentinels(array $fields)
    {
        $timestamps = [];
        $deletes = [];
        $fields = $this->removeSentinel($fields, $timestamps, $deletes);

        return [$fields, $timestamps, $deletes];
    }
public function findSentinels ( array $ fields ) { $ timestamps = [ ] ; $ deletes = [ ] ; $ fields = $ this -> removeSentinel ( $ fields , $ timestamps , $ deletes ) ; return [ $ fields , $ timestamps , $ deletes ] ; }
Search an array for sentinel values, returning the array of fields with
sentinels removed, and a list of delete and server timestamp value field
paths.

@param array $fields The input field data.
@return array `[$fields, $timestamps, $deletes]`
Search an array for sentinel values returning the array of fields with sentinels removed and a list of delete and server timestamp value field paths .