When building an array from an array: IF var is SET, INCREMENT else SET to 1

Question

Hi i've tried many solutions, but can't find what i'm after. I'm building an array from a number of other arrays, I could do something like this:

isset($setinc) ? $setinc++ : $setinc=1;

~~However when when the var is:~~

$output[ $data[ 'electoral_nation' ] ][ 'regions' ][ $data[ 'electoral_region' ] ][ 'constituencies' ][ $data[ 'electoral_constituency_id' ] ][ 'national_candidates' ]

It all gets very messy when there are over 600 comparisons and loops, is there a way I can simplify it rather than this?

isset($output[ $data[ 'electoral_nation' ] ][ 'regions' ][ $data[ 'electoral_region' ] ][ 'constituencies' ][ $data[ 'electoral_constituency_id' ] ][ 'national_candidates' ]) ? $output[ $data[ 'electoral_nation' ] ][ 'regions' ][ $data[ 'electoral_region' ] ][ 'constituencies' ][ $data[ 'electoral_constituency_id' ] ][ 'national_candidates' ]++ : $output[ $data[ 'electoral_nation' ] ][ 'regions' ][ $data[ 'electoral_region' ] ][ 'constituencies' ][ $data[ 'electoral_constituency_id' ] ][ 'national_candidates' ]=1;

~~I'm running PHP8 so the null coalescing operator is an option, but can't quite get my head round it. This is to stop the Undefined Array Key error.~~

Thanks in advance!

Edit: Ok so some of the above is appearing to be a distraction. Therefore, to clarify. Is there a way of writing the following but only declaring $setinc ONCE

isset($setinc) ? $setinc++ : $setinc=1;

i.e.

isset($setinc) ? += 1 : == 1;

Share a minimum reproducible example of what you are trying to achieve. — nice_dev
– nice_dev, Commented Mar 24, 2023 at 9:21
Is this question significantly different from PHP: What value array key needs to have to cause next numeric key assignment? ? Can you not leverage the advice from How do you reindex an array in PHP but with indexes starting from 1? — mickmackusa
– mickmackusa ♦, Commented Mar 24, 2023 at 9:58
Why you doesn't create an object ? Because $output seems like very big array. — JC Cavalca
– JC Cavalca, Commented Mar 24, 2023 at 10:56
Thanks all. Nice, I will try and do that today. Mick, I believe it is, its very different. JC, what benefit would that serve? — Ben
– Ben, Commented Mar 26, 2023 at 7:36

JC Cavalca · Accepted Answer · 2023-03-25 09:19:11Z

It's not a perfect example because you have to change the naming, but I think it's enough short and clean. A last thing, you have to check the key $electoralConstituencyId in 'constituencies' exist in else case. In this example, I doesn't that.

$electoralNation = $data[ 'electoral_nation' ] ?? null; $electoralRegion = $data[ 'electoral_region' ] ?? null; $dataElectoralConstituencyId = $data[ 'electoral_constituency_id' ?? null; if (null === $electoralNation || null === $electoralRegion || null === $dataElectoralConstituencyId) { throw exception; } $keysInRightOrder = [$electoralNation, 'regions', $electoralRegion, 'constituencies', $electoralConstituencyId]; if ($this->arrayKeysInOrderExists($keysInRightOrder, $output)) { $output[$electoralNation]['regions'][$electorRegion]['constituencies'][$electoralConstituencyId]++; } else { $output[$electoralNation]['regions'][$electorRegion]['constituencies'][$electoralConstituencyId] = 1; } public function arrayKeysInOrderExists(array $keys, array $array): bool { foreach ($keys as $key) { if (array_key_exists($key, $array)) { $array = $array[$key]; } else { return false; } } return true; }

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