PHP Array

OK i am very new to PHP so please be gentle LOL. 

I am posting a form to Liveaddress API and then i get the response back in an array it looks like this 

Array
(
    [0] => Array
        (
            [input_index] => 0
            [candidate_index] => 0
            [delivery_line_1] => 13700 Oakland St
            [last_line] => Highland Park MI 48203-3173
            [delivery_point_barcode] => 482033173009
            [components] => Array
                (
                    [primary_number] => 13700
                    [street_name] => Oakland
                    [street_suffix] => St
                    [city_name] => Highland Park
                    [state_abbreviation] => MI
                    [zipcode] => 48203
                    [plus4_code] => 3173
                    [delivery_point] => 00
                    [delivery_point_check_digit] => 9
                )

            [metadata] => Array
                (
                    [record_type] => S
                    [zip_type] => Standard
                    [county_fips] => 26163
                    [county_name] => Wayne
                    [carrier_route] => C021
                    [congressional_district] => 14
                    [rdi] => Commercial
                    [elot_sequence] => 0024
                    [elot_sort] => A
                    [latitude] => 42.40858
                    [longitude] => -83.08783
                    [precision] => Zip9
                )

            [analysis] => Array
                (
                    [dpv_match_code] => Y
                    [dpv_footnotes] => AABB
                    [dpv_cmra] => N
                    [dpv_vacant] => N
                    [active] => Y
                    [footnotes] => L#
                )

        )

)

How would i take primary_number and turn that into a variable to then insert into a database?

Thanks,

T