Merging multi dim arrays on ID in array value - php

Question

I have a bigger multi dim array I pull from a db.
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"
}
from another DB server I pull this array
array(73287) {
[0]=>
array(2) {
["ARTNUM"]=>
string(5) "0422272221"
["QUALITAETSMERKMAL"]=>
string(1) "p"
}
[1]=>
array(2) {
["ARTNUM"]=>
string(5) "04233337133333"
["QUALITAETSMERKMAL"]=>
string(1) "m"
}
When I excecute the following from user interface
foreach($aStockArticles as $aStockArticle) {
foreach($aArticleStamm as $artikel)
{
if($aStockArticle['artnum'] == $artikel['artnum'])
{
$aStockArticle['quality'] = $artikel['QUALITAETSMERKMAL'];
}
} }
I recieve
[line 451] [code ] [message Maximum execution time of 30 seconds
exceeded]
As you can see, the amount of articles and the sequence they are ordered can differ from each other.
Since I have no access environment variables
I usually would do a simple join in the db query but in this case its not possible due to the two db servers.
QUESTION:
How do I merge these arrays on the ID (artnum)?
So it looks like the following and stay within the excecution time?
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"
}