Array_diff getting error Array to string conversion php - php

Question

i want array_diff using this code i am also getting output but same time error occur
"Array to string conversion"
I am using codeigniter, i am getting post value in second array(listingdata) with method $this->input->post(); , but my first array getting some dynamic key and value then this two array diff give me output but some time getting error.
Please Help me
Any solution always welcome.
if(isset($_POST)){
foreach($_POST as $key => $value) {
$arr[$key] = $value; // making array
}
}
$result = array_diff($arr,$listingdata);
print_r($result);
print_r($arr);
print_r($listingdata);
My $arr array
Array
(
[itemTitle] => fdafdas
[subtitle] => fadsfdas
[quantity] => 12
[itemDescription] => fdas
[hide_ebay_id] => 89
[ebay_user] => Array
(
[0] =>
)
[ebay_category] => 2984
[e_sub_cat] => 20433
[e_second_child_sub_cat] => 117027
[e_third_child_sub_cat] =>
[ebay_upc] => 31231241341
[Brand] => Unbranded
[MPN] => Does_Not_Apply
[Model] => fsdf
[Country/Region_of_Manufacture] => Unknown
[listingType] => FixedPriceItem
[listingduration] => Days_5
[buy_it_now_price] => 20.00
[shippingtype] => Flat
[fshippingservice] => USPSPriorityFlatRateBox
[shippingservicecost] => 2.0
[shippingsac] => 3.0
[internationalhc] =>
[paypalemailaddress] => sam#jaff.in
[dispatchtimemax] => 3
[location] => CA
[ebaycountry] =>
[ebay_paypalemail] =>
[ReturnsAccepted] => ReturnsAccepted
[returnswithin] => Days_14
[refundoption] => MoneyBack
[shippingcostpaidbyoption] => Seller
[policydescription] => wqdewvfdgbfdggrbf
)
This is my another Array
Array
(
[itemTitle] => fdafdas
[subTitle] => fadsfdas
[categoryId] => 117027
[itemDescription] => fdas
[listingType] => FixedPriceItem
[listingDuration] => Days_5
[startPrice] =>
[buyItNowPrice] => 20.00
[quantity] => 12
[upc] => 31231241341
[paypalEmailAddress] => sam#jaff.in
[returnWithin] => Days_14
[RefundOption] => MoneyBack
[ShippingCostPaidByOption] => Seller
[returnsAccepted] => ReturnsAccepted
[shippingType] => Flat
[cshippingService] =>
[fshippingService] => USPSPriorityFlatRateBox
[dcPostalcode] =>
[ShippingServiceCost] => 2.0
[dshippingPackage] =>
[shippingHandlingcost] =>
[shippingServiceAdditionalCost] => 3.0
[currency] => USD
[country] =>
[location] => CA
[dispatchTimeMax] => 3
[pictureUrl] => Array
(
[0] => http://jaftech.in/ashprey/uploads/69.jpg
)
[policyDescription] => wqdewvfdgbfdggrbf
[internationalShipping] =>
[internationalShippingType] =>
[internationalShippingServiceCost] =>
[internationalshippingServiceAdditionalCost] =>
[cinternationalshippingService] =>
[finternationalshippingService] =>
[internationalShipToLocation] =>
[internationaloriginatingPostalCode] =>
[internationalshippingHandlingcost] =>
[ishippingPackage] => PackageThickEnvelope
[pid] => 89
)

Answer 1

This is because array_diff compares values after typecasting both compared values to string (see documentation notes).
Both of your arrays contain another array (ebay_user and second pictureUrl).
See this answer for recursive array_diff, which should work in your case.