I want to get my table's column name. when i use model::all();
Users::all();
Illuminate\Database\Eloquent\Collection Object 
(
    [items:protected] => Array
        (
            [0] => Users Object
                (
                    [table:protected] => users
                    [hidden:protected] => Array
                        (
                            [0] => password
                            [1] => remember_token
                        )
                    [fillable] => Array
                        (
                        )
                    [connection:protected] => 
                    [primaryKey:protected] => id
                    [perPage:protected] => 15
                    [incrementing] => 1
                    [timestamps] => 1
                    [attributes:protected] => Array
                        (
                            [id] => 1
                            [first_name] => Mohammed Saqib
                            [last_name] => Rajput
                            [email] => rajput.saqib@hotmail.com
                            [dob] => 2015-06-18 00:00:00
                            [mobile] => 03006710419
                            [status] => inactive
                        )
                    [original:protected] => Array
                        (
                            [id] => 1
                            [first_name] => Mohammed Saqib
                            [last_name] => Rajput
                            [email] => rajput.saqib@hotmail.com
                            [dob] => 2015-06-18 00:00:00
                            [mobile] => 03006710419
                            [status] => inactive
                        )
                    [relations:protected] => Array
                        (
                        )
                    [visible:protected] => Array
                        (
                        )
                    [appends:protected] => Array
                        (
                        )
                    [guarded:protected] => Array
                        (
                            [0] => *
                        )
                    [dates:protected] => Array
                        (
                        )
                    [touches:protected] => Array
                        (
                        )
                    [observables:protected] => Array
                        (
                        )
                    [with:protected] => Array
                        (
                        )
                    [morphClass:protected] => 
                    [exists] => 1
                )
        )
)