array(43593) {
  [0]=>
  array(4) {
    ["artnum"]=>
    string(5) "0422272221"
    ["ekprice"]=>
    string(5) "52.78"
    ["ekpriceist"]=>
    string(5) "52.78"
    ["lieferantnr"]=>
    string(7) "7000202"
  }
  [1]=>
  array(4) {
    ["artnum"]=>
    string(5) "04233337133333"
    ["ekprice"]=>
    string(5) "49.45"
    ["ekpriceist"]=>
    string(5) "49.45"
    ["lieferantnr"]=>
    string(7) "7000211"
  }

array(73287) {
  [0]=>
  array(2) {
    ["ARTNUM"]=>
    string(5) "0422272221"
    ["QUALITAETSMERKMAL"]=>
    string(1) "p"
  }
  [1]=>
  array(2) {
    ["ARTNUM"]=>
    string(5) "04233337133333"
    ["QUALITAETSMERKMAL"]=>
    string(1) "m"
  }

foreach($aStockArticles as $aStockArticle) {

                foreach($aArticleStamm as $artikel)
                        {
                            if($aStockArticle['artnum'] == $artikel['artnum'])
                            {
                                $aStockArticle['quality']  = $artikel['QUALITAETSMERKMAL'];
                            }
                        }   }

array(43593) {
  [0]=>
  array(4) {
    ["artnum"]=>
    string(5) "0422272221"
    ["ekprice"]=>
    string(5) "52.78"
    ["ekpriceist"]=>
    string(5) "52.78"
    ["lieferantnr"]=>
    string(7) "7000202"
    ["QUALITAETSMERKMAL"]=>
    string(1) "p"
  }
  [1]=>
  array(4) {
    ["artnum"]=>
    string(5) "04233337133333"
    ["ekprice"]=>
    string(5) "49.45"
    ["ekpriceist"]=>
    string(5) "49.45"
    ["lieferantnr"]=>
    string(7) "7000211"
    ["QUALITAETSMERKMAL"]=>
    string(1) "m"
  }