Merging and combining two arrays in PHP - php

Question

I have two arrays one created from a table in my database and one created from a HTML form (lets call them array_db and array_form).
I want to insert array_db to a table in my mySQL database, but before inserting I must merge array_db with array_form and remove duplicates. When there are a duplicates I want the values from array_form to be inserted to array_db
NOTE: array_form are not always the same meaning it could have more or less values than in the below ex.
What is the best way to do this?
Array_db
Array
(
[task_id] => task_id
)
Array
(
[user_id] => user_id
)
Array
(
[customer_id] => customer_id
)
Array
(
[created] => created
)
Array
(
[pickup] => pickup
)
Array
(
[tire_front] => tire_front
)
Array
(
[tire_back] => tire_back
)
Array
(
[tire_reg] => tire_reg
)
Array
(
[tire_indl] => tire_indl
)
Array
(
[tube_front] => tube_front
)
Array
(
[tube_back] => tube_back
)
Array
(
[hub_front] => hub_front
)
Array
(
[hub_back] => hub_back
)
Array
(
[hub_adjust] => hub_adjust
)
Array
(
[rim_front] => rim_front
)
Array
(
[rim_back] => rim_back
)
Array
(
[rim_adjust] => rim_adjust
)
Array
(
[spoke_missing_front] => spoke_missing_front
)
Array
(
[spoke_missing_back] => spoke_missing_back
)
Array
(
[spoke_comp_front] => spoke_comp_front
)
Array
(
[spoke_comp_back] => spoke_comp_back
)
Array
(
[break_adjust_front] => break_adjust_front
)
Array
(
[break_adjust_back] => break_adjust_back
)
Array
(
[break_cable_front] => break_cable_front
)
Array
(
[break_cable_back] => break_cable_back
)
Array
(
[break_pad_front] => break_pad_front
)
Array
(
[break_pad_back] => break_pad_back
)
Array
(
[gear_adj_front] => gear_adj_front
)
Array
(
[gear_adj_back] => gear_adj_back
)
Array
(
[gear_cable_front] => gear_cable_front
)
Array
(
[gear_cable_back] => gear_cable_back
)
Array
(
[gear_shift_front] => gear_shift_front
)
Array
(
[gear_shift_back] => gear_shift_back
)
Array
(
[bicy_chain] => bicy_chain
)
Array
(
[cog_wheel] => cog_wheel
)
Array
(
[cassette] => cassette
)
Array
(
[chainwheel] => chainwheel
)
Array
(
[crankset] => crankset
)
Array
(
[crank] => crank
)
Array
(
[fp_service] => fp_service
)
Array
(
[status] => status
)
Array
(
[service_1] => service_1
)
Array
(
[service_2] => service_2
)
Array
(
[service_3] => service_3
)
Array
(
[service_4] => service_4
)
Array
(
[price_approx] => price_approx
)
Array
(
[price_max] => price_max
)
Array_form
(
[tire_back] => tire_back
[tube_back] => tube_back
[gear_shift_front] => gear_shift_front
[user_id] => 0
[customer_id] => 6
)

Answer 1

As I said in my comment, this should be solveable by first flattening $array_db, eg like this
$flat_array_db = array();
foreach ($array_db as $subArray) {
foreach ($subArray as $key=>$value) {
$flat_array_db[$key] = $value;
}
}
And once you've done that, a simple array_merge($flat_array_db, $array_form) should do the trick.