[Phpwm] updating an array

[David Long]

alan dunn wrote:
> here is my prodarray after the first iteration:
>
> Array ( [8x6_blue] => 2 [7x5_blue] => 4 [3x2_and_pass] => 4 [jobcard] 
> => 2 )
>
> then my next line has quantity 3 of 8x6_blue
>
> now I want to say if 8x6_blue is in_array prodarray (as a key value) 
> add 3 to 2
>
> but in_array is saying does 8x6_blue equal '2' or '4' or '4' or '2'
> which of course it doesn't

You need array_key_exists instead of in_array for this:

    // loop through second array
    foreach ($secondarray as $key => $qty)
    {
        if(array_key_exists($key, $prodarray))
        {
            $prodarray[$key] += $qty;
        }
        else
        {
            $prodarray[$key] = $qty;
        }
    }

You could also use isset($prodarray[$key]) in this situation, but in 
cases where null values are used in the array it doesn't quite work as 
you expect (see the isset documentation for more details).

If you don't care about PHP warnings, non-existent array keys return 
NULL, which are converted to 0 if you treat them as an integer, so you 
don't even need to do the test:

    // loop through second array
    foreach ($secondarray as $key => $qty)
    {
        $prodarray[$key] += $qty;
    }

Dave