help comparing arrays

[8ginga8]

Hi,
I hope that some one can help me, I am new at PHP and I am trying to take the results from 2 querys and return the difference and maybe even take it a bit further. Here is an example.

array 1:
toplevel 1111
part QTY
a 1
b 1
c 6

array 2:
toplevel 2222
part QTY
a 4
c 2
e 2

what I want is this output
Output:
the toplevel 1111 different from toplevel 2222
part QTY
a -3
b 1
c 4
e 2

 

[altendew]

You could try this

$array3 = array()
foreach($array1 as $part=>$QTY)
{
$array3[$part] = $QTY-$array2[$part];
}

Ok in this example we loop though each element in the first array. Then we take its value and subtract it from $array2, and then store it in $array3.