Check for existing values with if in foreach? - php

Question

I have array with already existing values:
$existingValues = array();
now i get new values in xml file (is a import script) but i have to avoid insert of already existing values, my question is, how can i do a if check in foreach where i list all new values from xml?
$i = 1;
foreach($node->children() as $child) :
$attribute2 = $child->attributes();
$productcode = $attribute2['sku'];
$productvariant = $attribute2['variantid'];
$productprice = $attribute2['price'];
if ($attribute2['sku']) :
echo $productcode . ' - ' . $productvariant . '<br>';
endif;
$i++;
endforeach;
I tried with in_array() but it's not correct.

Answer 1

You can create an array wich stores the products and test if the current product is already in the array:
$i = 1;
$products = array();
foreach($node->children() as $child) :
$attribute2 = $child->attributes();
$productcode = $attribute2['sku'];
$productvariant = $attribute2['variantid'];
$productprice = $attribute2['price'];
if ($attribute2['sku'] && !in_array($productcode, $products)) :
echo $productcode . ' - ' . $productvariant . '<br>';
endif;
$products[] = $productcode;
$i++;
endforeach;

Answer 2

You can create a $existingSKU array, extracting sku from existing elements. Then you can compare current sku with existing, and if not present, you can add element to existing.
// build existing sku array
$existingSKU = array();
foreach($existingValues as $value)
{
array_push($existingSKU, $value['sku']);
}
// add element to existing, if not present
foreach($node->children() as $child)
{
$attribute2 = $child->attributes();
if(!in_array($attribute2['sku'], $existingSKU))
{
array_push($existingValues, $attribute2);
}
}
Since you don't use it, you can remove $i.