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1. You need an array to put all the data you're receiving. $newArray isn't the greatest name but it'll work for the moment. 2. For each price item you receive from the API, check if you have it in that array already: if so then update its list of stores, otherwise add it. It looks like $Data is: an array of prices, where each price is a "prices" object, and that object has a private "container" array of the data. The problem here is that you can't (nor, in fact, should) add anything to that container array: it pollutes the concept of the "prices" object with data it doesn't know about. In your shoes, I think I would change the above approach to be: you have two arrays, one of all the prices with no store data, and another that tells you which prices are in which store. The new approach is: 1. You need the one array for all the data - let's say "$allPrices". You need a second array just to associate prices with stores - let's say "$pricesToStores". 2. For each price item you receive from the API, add it to $allPrices. Because there will be duplicates, don't add it blindly but instead index the array by the unique identifier; that'll be either the "prd" or the "id", I can't tell. 3. At the same time, add information to $pricesToStores for the price item and the store. They should be indexed by the prd/id as well, and the array values can be the set of stores it was found in. There's probably a small issue though: when two stores have the same item, is the data for those two items exactly the same? I think not. My guess is that the "prd" will be the same but the "id" will not (or vice versa). If you simply keep one of the prices in $allPrices then you lose what the other ones were, so perhaps you might need to retain all the prices together in a sub-array. But if you have to do that, does the price data mention which store it came from already? Because if it does then the $pricesToStores array is pointless. So after all that, a question: what does the price data look like for 2+ stores that have the "same" one?