php multidimensional arrays updating based on keys

Question

I have two arrays inventoryStock and posStock (point of sale stock) they both use product sku numbers as the key and the value is the quantity on hand I need to somehow update the posStock with the values from $inventoryStock where there keys are matching.

Examples of arrays:

inventoryStock{
   abs-0098 => 5,
   abs-0099 => 23,
   abs-0100 => 8,
   abs-0101 => 19
}

posStock{
 abs-0098 => 5,
 abs-0099 => 23,
 abs-0101 => 15
}

I need the posStock to be the same as the inventoryStock I cannot just make posStock be inventory stock becasue inventory stock has extra products not listed in the Point of sale.

IMO it is not very clear as to what you want the result to be. Maybe you could post an array of what you want the combinedStock to be. — Jonathan Kuhn, Jan 14 '15 at 18:40
I agree a resulting array would be helpful, I disagree with those voting to close this question as *'Too Broad'*. — Jason McCreary, Jan 14 '15 at 18:41

score 2 · Answer 1 · answered Jan 14 '15 at 18:34

2

You can use array union.

The + operator returns the right-hand array appended to the left-hand array; for keys that exist in both arrays, the elements from the left-hand array will be used, and the matching elements from the right-hand array will be ignored.

In your case (if I understand the spec correctly):

$newPOSStock = $inventoryStock + $posStock;

answered Jan 14 '15 at 18:34

Jason McCreary

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Just for completion sake, this is exactly opposite of array_merge where keys in the left array are overwritten by keys in the right array(s). Sometimes you want to keep the values on the left and use `+` and sometimes you want to keep the values on right and use array_merge. – Jonathan Kuhn Jan 14 '15 at 18:37
Indeed. Thanks @Jonathan Kuhn. – Jason McCreary Jan 14 '15 at 18:38

Richard Christensen · Accepted Answer · 2015-01-14T19:06:17.220

You are looking for the array_key_exists() function of PHP.

foreach ($inventoryStock as $key => $value) {
      if (array_key_exists($key, $posStock)) {
        $posStock[$key] = $value;
        continue; // Continue Loop
      }
      // Do something if the array key doesn't exist.
    }

To expand on why I would do it this way. I now have a logic block to allow me to do something if the array key doesn't exist like add it to the PosStock, or if I want to or change values of other variables to trigger other behaviors.

php multidimensional arrays updating based on keys

2 Answers2